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Question 1 of 194
1. Question
A boy runs 100 in due north and then 100 in due east is its displacement?
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Question 2 of 194
2. Question
The speed of an air force jet was 400 m/s when it flew past an anti-aircraft sun. Calculate its distance from the gun 4s later when the gun was fire
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Question 3 of 194
3. Question
A mango fruit dropped to the ground from the top of a tree 40m tail. Find, how long it takes the fruit to reach the ground if acceleration due to gravity (g = 10m/s2)
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Question 4 of 194
4. Question
A 0.1m long elastic band extends 5mm when a load of 80N is hung from  Its end Calculate the strain on the band
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Question 5 of 194
5. Question
Which of the following statements describes what happened when an ice block that floats in a glass of water that is tilled to the brim melts?
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Question 6 of 194
6. Question
A machine with a mass of 4kg fires a 45g bullet at a speed of l00m/s. Find the recoil speed of the machine gun
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Question 7 of 194
7. Question
Which of the following would you use to determine the weight of an object?
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Question 8 of 194
8. Question
The force that causes an object to move in a circular path is called
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Question 9 of 194
9. Question
A solid suspended by a piece of string is completely immersed in water. On attempting to lift the solid out of the water, the string breaks when the solid is partly out of the water. This is because
CorrectIncorrect -
Question 10 of 194
10. Question
The following statements were made by some students describing lint happened during and experiment to determine the melting point of solids
i. The temperature of the solid was constant until melting started
ii. The temperature of the solid rose until melting started
iii. During melting, the temperature was rising
iv. During melting, the temperature was’ constant
v. The temperature continued to rise after all the solid tad melted
vi. Temperature stopped rising after the’ solid had melted.
Which of the following gives correct statements in the right order?CorrectIncorrect -
Question 11 of 194
11. Question
When some grains of table salt were put in a cup of cold water, kept at constant temperature and left undisturbed, all the water tasted salty after sometime. This is due to
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Question 12 of 194
12. Question
Given that the latent heat of fusion of ice is 80 cal/g, how much heat will change 100g of ice at 0°C into water at the same Temperature?
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Question 13 of 194
13. Question
A blacksmith dropped a 1.5kgironbead At 300°C into some quantity of water. If the temperature of the water rose from 15°C to 18°C, what is the mass of the water assuming no heat is lost to the surrounding? (Take the specific heat of iron as 0.46Jkg1c1 and that of water as 4.2 xl03Jkg-1 c-1
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Question 14 of 194
14. Question
Which of the following properties are not those of a suitable thermometric liquid?
I. It should be a good conductor of heat
II. It should be opaque
III. Its expansion should be regular
IV. It should wet glass
V. It should have a high melting point and low boiling pointCorrectIncorrect -
Question 15 of 194
15. Question
A gas at pressure P1N/m2 and temperature 30°C is heated to 61°C at constant volume. Find its new pressure
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Question 16 of 194
16. Question
A steel bar has a width of 10cm at 50°C At what temperature will it fit exactly into a hole of constant width 10.005cm if coefficient of linear expansion of steel is l1x 10-6 c-1?
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Question 17 of 194
17. Question
The amount of heat that is required to raise the temperature of unit mass of a substance one degree Celsius is called
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Question 18 of 194
18. Question
Two lamps rated 60W and 240V each are connected in series. What is the total power dissipated in both
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Question 19 of 194
19. Question
Three 3 resistors connected in parallel have a potential difference of24V applied across the combination. What is the current in each resistor?
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Question 20 of 194
20. Question
If PHCN charges 25k per kwh, find the cost of operating for 36hours a lamp requiring 1.5A on a 240V line
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Question 21 of 194
21. Question
In order to convert a galvanometer to a Voltmeter
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Question 22 of 194
22. Question
Which of the following is not applicable to ac generator?
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Question 23 of 194
23. Question
A potential difference of 5Vis used to produce a current of 4A for 4 hours through a heating coil. What is the heat produced?
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Question 24 of 194
24. Question
Determine the absolute temperature at which the Fahrenheit- temperature is twice the Celsius temperature
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Question 25 of 194
25. Question
Which other following law forms the Basis of the thermometry?
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Question 26 of 194
26. Question
A 500rn Tong aluminum chair expands when it was placed in the sun. Its temperature increases from 20°C to 60°C. Determine its new length.{μ=2.30c 10-5K-1}
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Question 27 of 194
27. Question
An electric heater which produces 900W of power is used to vaporize, water. How much water at 100°C can be changed to steam in 3 mins by the heater’?
[Heat of vaporization = 2.26 × 106 J/kg, Specific heat capacity of water 4.2 × 103 J/kg. K]
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Question 28 of 194
28. Question
The amount of heat required to produce unit temperature rise in a substance is called
CorrectIncorrect -
Question 29 of 194
29. Question
An ideal gas has a volume 1 00crn3, at 1×105 Pa and 27°C. What is its volume at  2×105 Pa and 60°C?
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Question 30 of 194
30. Question
Which of the following thermometer can be used to measure high temperature up to 1000°C?
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Question 31 of 194
31. Question
4000J of heat is applied to a 1.5kg silver pendant initially at temperature of 15°C Determine its final temperature (Latent heat =336 kg, specific heat capacity = 233)/kg. K]
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Question 32 of 194
32. Question
The specific heat capacity of a substance depends on all the following expect
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Question 33 of 194
33. Question
Which of the following quantities is a Vector?
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Question 34 of 194
34. Question
A hose ejects water at 80cl/s through a hole 2mm in diameter. The water impinges on a wall and drops off without rebounding. What is the force on the wall?
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Question 35 of 194
35. Question
A train traveling at 72km/h undergoes a uniform retardation of 2m/s2 when brakes are applied. Find the distance travelled from the place where the brakes are applied
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Question 36 of 194
36. Question
A force of 200Npulls a sledge of mass 50kg and overcomes a constant frictional force of 40N. What is the acceleration of the sledge?
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Question 37 of 194
37. Question
An object A of mass 2kg is moving with a velocity of 3m/s and collides head-on with another object B of mass 1kg moving in the opposite direction with a velocity of 4m/s. Assuming the objects move off  together after collision, calculate their common velocity
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Question 38 of 194
38. Question
In elastic collision, which of the following quantities is conserved?
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Question 39 of 194
39. Question
A weight of 20N hangs from a fixed point by a light inextensible string. It is pulled aside by a horizontal force with the string inclined at an angle of 30° to the vertical. The tension in the string is
CorrectIncorrect -
Question 40 of 194
40. Question
A stone of mass 50kg released from height of 20m in above the ground. If the stone falls freely to a height of 5m in above the ground, its velocity is [g=9.8m/s]
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Question 41 of 194
41. Question
Calculate the kinetic energy of a -trolley of mass 40kg moving with a velocity 0.5 m/s
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Question 42 of 194
42. Question
A car of mass 500kg accelerates from rest a 1 m/s2. What is the total distance covered in 1 minute?
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Question 43 of 194
43. Question
Niagara Falls are 50m high. Calculate the potential energy of 0.1 cubic meter of water at the top relative to the bottom. Density of water is 1000kgm3 Take g= 10m/s2
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Question 44 of 194
44. Question
A bullet of mass 1 5g is fired from a riffle with a velocity 100m/s. If the mass of thriffle is 1kg. What is the recoil velocity of the riffle?
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Question 45 of 194
45. Question
A ball is thrown vertically upwards with a velocity of 30m/s. Find the greatest height attained
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Question 46 of 194
46. Question
The tension in a rope pulling a log is 100N, the mass of the log is 50kg and the frictional force on the log is 20N. What is the acceleration of the log?
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Question 47 of 194
47. Question
A body of mass 1kg falls freely, from rest Through a height of 150m. Calculate the velocity of the body when it strikes the floor(g= 10m/s2)
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Question 48 of 194
48. Question
A car moving with a velocity of 16m/s accelerates uniformly at the rate of 1m/s2 to reach a velocity of 20m/s. Find the distance covered
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Question 49 of 194
49. Question
An athlete runs 100m in 112s. What is his speed in km/h?
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Question 50 of 194
50. Question
Which of the following statements best describes the specific heat capacity of a Substance?
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Question 51 of 194
51. Question
Determine the temperature whose Fahrenheit and Kelvin scales have the same reading to the nearest degree
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Question 52 of 194
52. Question
The SI unit of specific heat capacity of a substance is
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Question 53 of 194
53. Question
The density of nitrogen at standard temperature and pressure is 1.25 lkgm-3. Calculate the root mean square velocity of nitrogen molecules
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Question 54 of 194
54. Question
Ama1aiia patient has a body temperature of 98.6°F. What is this temperature on the Celsius scale?
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Question 55 of 194
55. Question
A thermos bottle containing 250g of coffee a 90°C is added with a 209 of milk at 5°C after thorough mixing, what is the final temperature for water, coffee and milk is 1.00Cal/goC
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Question 56 of 194
56. Question
Determine the temperature that results when 150g of ice at 0°C is mixed 300g of water at 0°C [S.H. C of H2O S.H.C of ice=3.36x 105K/gK]
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Question 57 of 194
57. Question
The only mode of heat energy transfer that needs no material medium is
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Question 58 of 194
58. Question
When heat energy is added to a system which of the following observations usually occur:
(I) The internal energy  of the system increases
(II) Work may be done on the surroundings
(III) The volume of system is directly proportional to the temperature.CorrectIncorrect -
Question 59 of 194
59. Question
The transfer of heat energy from one part of a body to another part without the actual movement of any part of the body is called convection
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Question 60 of 194
60. Question
Which of the following quantities are Scalars?
I. Mass
II. Work
III. Force
IV. Magnetic fluxCorrectIncorrect -
Question 61 of 194
61. Question
A force (15i – 16j + 27k)N Is, added to a force (23j – 40k)N. What is the magnitude of the resultant?
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Question 62 of 194
62. Question
Which of the following statements is/are correct about an object in equilibrium Under parallel forces?
I. The total force in one direction equals the total force in the opposite direction
II. The body must not rotate
III. The resolved components along the axis equals the resolved co1onents along the
y-axis.CorrectIncorrect -
Question 63 of 194
63. Question
A car moving with a speed of 90km/h was brought to rest in l0s by the application of the brakes. How far did the car travel after the brakes were applied
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Question 64 of 194
64. Question
A metre rule is found to balance at the 48cm mark. When a body ofmass 60g is suspended at the 6cm mark, the balance point is found to be at the 30cm mark. Find the mass of the metre rule
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Question 65 of 194
65. Question
A ball of mass 0.1kg moving with a horizontal velocity of 1 5m/s is shot into a wooden block of mass 0.4kg 1yitg at rest or a smooth horizontal surface. Find their common velocity after impact
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Question 66 of 194
66. Question
A body of mass 2kg moves at a velocity of 10m/s. Neglecting air resistance, determine the kinetic energy of the body
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Question 67 of 194
67. Question
Three forces of magnitude 15N, 10N and SN act on a particle in the direction which make 120° with one another. Find the resultant and the angle the resultant makes with the x-axis
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Question 68 of 194
68. Question
Which of the following statements best defines a couple?
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Question 69 of 194
69. Question
A force F = (5i + 3j)N acts on a body and causes a displacement r= (7i -j)m. Determine the work done
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Question 70 of 194
70. Question
A force of 0.6N acts on a body of mass 40g, initially at rest. What is the resulting acceleration?
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Question 71 of 194
71. Question
Which of the following statements is not correct about stable equilibrium?
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Question 72 of 194
72. Question
A body is projected vertically upwards with a velocity of 9.78m/s. How high does it travel before it comes to rest momentarily at the top of its motion? (g=9.78m/s2)
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Question 73 of 194
73. Question
Calculate the time taken for a car to cover a distance of 125m if the initial speed is sand it has a constant acceleration of 1Sm/s2
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Question 74 of 194
74. Question
Calculate the braking force to bring a body of mass 1kg to rest from 25m/s on a level ground in 60m with uniform retardation
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Question 75 of 194
75. Question
A drop hammer is lifted to a height of 50m above the ground and then allowed to fall from rest on to a forging at ground “Level. Calculate the downward velocity of the hammer when it strikes the forging. (g=10m/s2)
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Question 76 of 194
76. Question
A uniform rod of weight 10N is balanced. At a removed to point 30cm from A. What force must be applied at A
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Question 77 of 194
77. Question
An equilateral triangular lamina has each side equal to 50cm. How far is the centre of gravity from each vertex?
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Question 78 of 194
78. Question
A man can row a boat at 13m/s in still water. If he aims at crossing to the opposite bank of a river flowing at 5m/s, at what angle to the bank of the river must he row the boat?
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Question 79 of 194
79. Question
The lower and upper fixed points of a thermometer are 30mm and 180mm respectively. Calculate the temperature in degrees Celsius when the thermometer reads 4Snim
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Question 80 of 194
80. Question
An immersion heater rated 400W, 220V is used to heat a liquid of mass 0.5kg. If the temperature of the liquid increases uniformly at the rate of 2.5o per second, calculate the specific heat capacity of the liquid assuming no heat loss
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Question 81 of 194
81. Question
A balloon filled with 1000cm3 of gas at 127°C and pressure of 70cmHg. If the pressure changes to 28crnHg and temperature to -23.3°C, calculate the new volume of the gas
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Question 82 of 194
82. Question
A density glass bottle contains 44.25g of a liquid at 0°C and 42.02g a 50°C Calculate the real cubic expansivity of the liquid(Linear expansivity of glass 1.0×10-5K-1
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Question 83 of 194
83. Question
Which of the following properties is not used to measure the temperature of a Substance?
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Question 84 of 194
84. Question
The clinical thermometer is characterized by having a
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Question 85 of 194
85. Question
The amount of heat given out or absorbed when a substance changes its state at
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Question 86 of 194
86. Question
A b1ock of aluminum is heated electrically by a 25W heater. If the temperature rises by 10°Cin 5minutes, what is the heat capacity of aluminum?
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Question 87 of 194
87. Question
In a gas experiment, if the pressure of the Gas is plotted against the reciprocal of the volume, the unit of the slope of the resulting curve is
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Question 88 of 194
88. Question
Thermal equilibrium between two objects exist when
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Question 89 of 194
89. Question
A shepherd calling to fellow shepherd heard his voice reflected by a rock 3s later. Calculate the velocity of sound in air if the rock is 510m away
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Question 90 of 194
90. Question
An object 3cm high placed on the axis of a converging lens form an image 30cm from the lens. If the focal length of the Lens is 15cm the height of the image is
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Question 91 of 194
91. Question
An object is placed between two plane mirrors inclined at 600 to each. If the object is equidistant from each find the number of images for me
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Question 92 of 194
92. Question
Before frying, the volume of 0.8g/cm3 vegetable oil was 500cm3.If the density of the oil was 0.5g /cm3 after frying and there was no loss of oil due to spilling, what is the new volume of the oil?
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Question 93 of 194
93. Question
A 650kg car that was initially rerave1ed with an acceleration of4m/s2. find its kinetic energy after 4s
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Question 94 of 194
94. Question
The temperature at which the water vapour present in the air and begins to condense is called
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Question 95 of 194
95. Question
Which of the following types of  waves will travel through vacuum?
I. Light waves
II. Sound ayes
III. Radio wavesCorrectIncorrect -
Question 96 of 194
96. Question
In a simple pendulum experiment, student increased the length of the indefensible string by a factor of 9. what factor is the period increased?
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Question 97 of 194
97. Question
A vapour is said to be saturated when
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Question 98 of 194
98. Question
A wave travels with a velocity of 360m/s. if its wavelength is 120cm then its period is
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Question 99 of 194
99. Question
The heights of the mercury thread in a mercury-in-glass thermometer when melting ice and then in steam arc 2cm and 22cm respectively. What would be the height of the mercury thread at 70°?
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Question 100 of 194
100. Question
An object is placed 45cm in front or a concave mirror of focal length 15cm. What the linear magnification produce
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Question 101 of 194
101. Question
A man has five 40W electric light bulbs, six 60W bulbs and two 100W bulbs in his house, If all the points are on for five hours daily and PHCN charges 12k per unit, what is his bill for 30 days?
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Question 102 of 194
102. Question
In a resonance tube experiment, the first resonance position is 16cm when the velocity of sound in air is 327.6 8m/s. Find the frequency of the tuning fork used
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Question 103 of 194
103. Question
Half-life of a radioactive substance is
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Question 104 of 194
104. Question
The headlamp bulb of a motor car is rated 60W, 1 2V. Calculate the resistance of its filament
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Question 105 of 194
105. Question
In an electrolysis experiment, a cathode of mass 4.5g weighs 4.52g after a current of 4.5A flows for 1hour. The electrochemical equivalent of the deposited substance is
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Question 106 of 194
106. Question
An object falls freely under gravity from a given height. At halfway point, kinetic energy is
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Question 107 of 194
107. Question
The silvered walls of a vacuum flask are used to prevent
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Question 108 of 194
108. Question
The law of universal gravitation states that
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Question 109 of 194
109. Question
The nucleus of an atom consists of
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Question 110 of 194
110. Question
A certain quantity of heat increases the temperature of 1 85g of water from 10°C to 20°C and increases the temperature of an equal volume of 140g of oil from 7°C to 18°C. The ratio of the specific heat of the oil is to that of water is
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Question 111 of 194
111. Question
The motion of the pendulum bob is
CorrectIncorrect -
Question 112 of 194
112. Question
Which of the following is not one of the factors that affect the capacitance of a capacitor?
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Question 113 of 194
113. Question
Which of the following statements is true of gamma-rays?
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Question 114 of 194
114. Question
The virtual image formed of an object placed 10cm from a convex lens is 2. Find the focal length of the lens
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Question 115 of 194
115. Question
A milliammeter of resistance 2.5 and full scale deflection of 50mA is to be used to measure a potential difference of 50V. What is the resistance of the multiplier?
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Question 116 of 194
116. Question
The ice aid steam points of a mercury-in- glass thermometer of centigrade scale and of uniform bore correspond respectively to 3cm and 23cm lengths of the mercury thread. What is the temperature when the length of the mercury thread is 12cm?
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Question 117 of 194
117. Question
When a ray of light passes from glass to air, it is
CorrectIncorrect -
Question 118 of 194
118. Question
What is the resistance of the filament of an electric lamp rated 220V, 100W?
CorrectIncorrect -
Question 119 of 194
119. Question
Pressure cooker cooks faster because
CorrectIncorrect -
Question 120 of 194
120. Question
A gasoline generator is used to power ten 40W lamps, five 60W lamps and musician’s 100W amplifing system. If the generator runs for 5 hours, the energy used is
CorrectIncorrect -
Question 121 of 194
121. Question
Which of the following statements is not true about sound waves?
CorrectIncorrect -
Question 122 of 194
122. Question
Which of the following statements is not true about the human eye?
CorrectIncorrect -
Question 123 of 194
123. Question
Hypermetropia can be corrected by using
CorrectIncorrect -
Question 124 of 194
124. Question
In the astronomical telescope
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Question 125 of 194
125. Question
Which of the following apparatuses is not needed for the production of pure spectrum?
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Question 126 of 194
126. Question
The principle of moment states that
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Question 127 of 194
127. Question
A uniform metre rule of mass 90g is pivoted at the 40cm mark. If the meter
rule is in equilibrium with an unknown mass M placed at the 10cm mark and 72g mass at the 70cm mark, then M isCorrectIncorrect -
Question 128 of 194
128. Question
A pole AB of length 10m weighs 800N and has its centre of gravity 4m from the end A, and lies on horizontal ground. The least vertical force required to lift its end B is
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Question 129 of 194
129. Question
A metre rule is found to balance horizontally at the 48cm mark.When a body of mass 60g is suspended at the 6cm mark the balance point shifts to the 30cm mark. The mass of the metre rule is
CorrectIncorrect -
Question 130 of 194
130. Question
The elastic limit of a material is
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Question 131 of 194
131. Question
A 10g mass placed on the pan of a spring balance causes an extension of 5cm. If a 15g mass is placed on the pan of the same spring balance, the extension produced is
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Question 132 of 194
132. Question
Which of the following does not reduce surface tension of a liquid?
I. Addition of impurities like detergent or alum to the liquid
II. Heating the liquid
III. cooling the liquidCorrectIncorrect -
Question 133 of 194
133. Question
Which of the following is not an application of capillarity?
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Question 134 of 194
134. Question
Which of the following statements is not correct?
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Question 135 of 194
135. Question
Which of the following is not simple harmonic motion?
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Question 136 of 194
136. Question
The period of a body making simple harmonic motion is defined as
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Question 137 of 194
137. Question
A machine gun fires a bullet with an initial velocity of 200m/s at an angle of 60o to the horizontal, if g = 10m/s2, the total time of flight of the bullet is
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Question 138 of 194
138. Question
A bullet of mass 20g is fired horizontally At a stationary wooden block of mass 380g with a velocity of200m/s. If the bullet embeds itself in the block, their common velocity is
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Question 139 of 194
139. Question
The velocity ratio of a simple machine is defined as
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Question 140 of 194
140. Question
A machine has a velocity ratio of 6 and is 80% efficient. The effort needed to lift a load of 300N with the aid of the machine is
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Question 141 of 194
141. Question
An open organ pipe has a length of 6m. If the speed of sound in air is 340m/s and neglecting the end-corrections, the frequency of its first overtone is
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Question 142 of 194
142. Question
A piano wire 0.5m long has a total mass of 0.01kg and is stretched with JI tension of 800N. The frequency of its fundamental note is
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Question 143 of 194
143. Question
Two capacitors of 8F and 10F are connected in series to a 100V de supply. The charge on either place of each capacitor is
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Question 144 of 194
144. Question
A conductor of length 5m carrying a current of 15A is placed in a uniform magnetic field of flux density 0.25T. If the conductor is placed at 60° to the field then the force on it is
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Question 145 of 194
145. Question
When an inclined plane of angle is used as a simple machine, its velocity ratio is
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Question 146 of 194
146. Question
Which of the following statements is not true of a real image formed by a concave mirror?
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Question 147 of 194
147. Question
A 8kg mass rests on an inclined plane. If the limiting frictional force is 50N and g = 10m/s2, then the angle of inclination of the plane is
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Question 148 of 194
148. Question
Which of these gives the dimension of Torque?
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Question 149 of 194
149. Question
An object of mass 80kg is kicked above the ground and in 20s it has reached a height of 600cm. Calculate the power of the object
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Question 150 of 194
150. Question
Which of these statements is true?
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Question 151 of 194
151. Question
A load of 2 tonnes is raised with 10N efforts. Calculate the mechanical advantage of the machine with which the load is raised
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Question 152 of 194
152. Question
An object of mass 4000g is 60cm above the ground. Calculate its kinetic energy 50cm above the ground (Take g -10m/s2)
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Question 153 of 194
153. Question
A fast moving object of mass 200g travels at 100m sand hits a block of wood of mass 2kg. The two bodies moved together after impact. Find the velocity with which they moved together after collision
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Question 154 of 194
154. Question
Determine the distance traveled by a particle whose initial velocity is 48 km/h, The particle accelerated uniformly at the rate of 1.8m/s2 and attained a velocity of 72km/h
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Question 155 of 194
155. Question
An object floats in a liquid with one third of its volume above the liquid surface. Determine the density of the liquid, if object density is 7100kg/m3 (Take g= 10m/s)
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Question 156 of 194
156. Question
A metal block of mass 2125g displaces 250cm3 of water. What is its density?
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Question 157 of 194
157. Question
A body starting from rest travels for 100s with uniform acceleration of 15m/s. What distance does it cover in the last 2 Seconds?
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Question 158 of 194
158. Question
A pile driver of mass 125kg falls though a height of 80m before striking the pile. What is its momentum at the instance strikes the pile? g = 10m/s2
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Question 159 of 194
159. Question
A gun weighing 1500kg fires a shot weighing 50kg with a velocity 360m. What is the recoil velocity of the gun?
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Question 160 of 194
160. Question
A car of mass 1000kg travels with velocity 45km/h on a rough road and it is brought to a rest after 10s. What is the force exerted on the car?
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Question 161 of 194
161. Question
A bridge 100m long weighs 500kN. A lorry weighing l00kN is 25m from one end of it. Find the force exerted at this support
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Question 162 of 194
162. Question
What is the kinetic energy of a rock of mass 220g after it has fallen freely for 5 seconds? g = 10m/s2
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Question 163 of 194
163. Question
When equal masses of iron and water are given equal quantity of heat, the piece of iron becomes much hotter than water after a shorter time because
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Question 164 of 194
164. Question
The speed of light in air is 3.0 x 108m/s. What is its speed in glass having a refractive index of 1.65?
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Question 165 of 194
165. Question
Atmospheric pressure is 1.0 x 105 N/m2Â If the barometer liquid has a density of 1250kg/m3, what is the minimum length of the tube required? g= 10m/s2
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Question 166 of 194
166. Question
Young’s modulus for steel is 2 x 1011N/m2. A weight of 100N hangs from a steel wire of length 3m and cross- sectional area 1.5 x 10-6m2. Calculate the extension is 0.25mm, calculate the extension produced
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Question 167 of 194
167. Question
A load of 50N is attached to one end of a diameter 2.4mm whose other end is fixed if the extension is 0.25mm, calculate the Young modulus of the material of the wire
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Question 168 of 194
168. Question
Which of the following statements is not true about the centre of gravity of a body?
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Question 169 of 194
169. Question
A car travels with a constant velocity of 45km/h for 10s. What is the distance it covers in this time?
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Question 170 of 194
170. Question
A body is projected vertically upwards with a velocity of 9.78m/s. How high does it travel before it comes to momentarily the top of its motion?
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Question 171 of 194
171. Question
Which of the following statements is not True about the friction force?
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Question 172 of 194
172. Question
A solid of mass 1kg suspended by a string, is completely immersed in water. If the tension in the string is 5N, calculate the up thrust on the solid of a keg 9. 78m/s2
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Question 173 of 194
173. Question
The resistance of a piece of wire of length 20m cross-sectional area 8.0 x 10-6m2 high resistivity 4.0×10-7 is
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Question 174 of 194
174. Question
A force of 0.6N acts on a body of mass 40kg, initially at rest. What is the resulting acceleration?
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Question 175 of 194
175. Question
An object of mass 10kg is pulled over a rough surface by a 20N force. The object accelerates at a rate of 1.5m/s2. Determine the frictional force between the object and the surface
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Question 176 of 194
176. Question
A body of mass 2kg, moving with velocity 5m/s collides with stationary body of mass 0.5kg if the two bodies move together after impact, calculate their common velocity
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Question 177 of 194
177. Question
A body of mass 200g and specific heat capacity 0.41/g.K cools from 37° to 31°C. Calculate the quantity of heat released by the body
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Question 178 of 194
178. Question
The length of mercury thread when. it is at 0°C, 100°C and unknown temperature X°C is 200mm, 220mm and 270mm respectively. Determine the value of X
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Question 179 of 194
179. Question
The linear expansively of substance is 1.2 x 10-4K. A cube of this substance has a volume of 8.0 x 103cm3 at 30°C calculate the increase in its volume at 80°c
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Question 180 of 194
180. Question
At what temperature will the volume of a given ideal gas be three times its volume at 0°C?
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Question 181 of 194
181. Question
A rectangular metal block volume 10-6m3at 273K is heated to 573K. Its coefficient of linear expansion is 12 x 10-5K, what is the percentage range of its volume?
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Question 182 of 194
182. Question
Calculate the time taken in minutes to heat 2.0kg of water from 30°C to 100 in an electric kettle that draws a current 3.0A from 240V supply. (Specific heat capacity is 4.2 x 103J/kg) neglect heat losses to the surrounding
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Question 183 of 194
183. Question
The amount of heat needed to raise the temperature of 10kg of copper by 1k is its
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Question 184 of 194
184. Question
Calculate the heat energy required to vaporise 50g of water initially at 80°C  if the specific heat capacity of water is 4.2J/g.K (Specific latent heat vapourisation of water is 2260 J/g)
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Question 185 of 194
185. Question
A piece of copper mass 200g is heated 100°C and is then quickly transferred to copper calorimeter of mass 10g, containing 100g of water whose initial temperature is 15°C. If the specific the capacity of copper and water are 400J/Kg.K and 4200J/kg.K, find the final temperature of the substance
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Question 186 of 194
186. Question
Which if the following statement is not correct about the assumptions of kinetic theory of gases?
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Question 187 of 194
187. Question
The ice and steam points of an ungraduated thermometer are 300mm apart. Calculate the length of thermometric liquid above the ice points which will correspond to a temperature of 75°C
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Question 188 of 194
188. Question
A piece of copper of mass 0.55kg is heated from 57°C to 100°C. What is the increase in the internal energy of the copper? (c= 3.80 J/kg.K)
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Question 189 of 194
189. Question
Two metals A and B lose the same quantity of heat when their temperatures drop from 20°C to 15°C. If the specific heat capacity of A is thrice that of B, calculate the ratio of mass of A to that of B
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Question 190 of 194
190. Question
Which of the following is/are observed when heat energy is added to a system?
(I) The internal energy of the system increases
(II) The volume of the system is directly proportional to the temperature
(iii) Work maybe done in the surroundingsCorrectIncorrect -
Question 191 of 194
191. Question
A constant volume gas thermometer records a pressure of 240mmHg at 0°C and 300mmHg at 100°C. Calculate the new temperature when the gas pressure is 270mm of Hg
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Question 192 of 194
192. Question
In which of the following is expansion of solids a disadvantage?
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Question 193 of 194
193. Question
How long does it take a 800W heater to raise the temperature of 2kg of water from 20°C to 60°C? (specific heat capacity of water= 4200J/kg. K)
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Question 194 of 194
194. Question
A room is heated by means of charcoal fire. A man in the room standing away from the fire is warmed by
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