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Question 1 of 50
The area under a force-time graph represents
Question 2 of 50
From the principle of flotation, a body sinks in a fluid until it displaces a quantity equal to its own
Question 3 of 50
Suppose three identical steel balls Q , R , and S , are placed on an undulating ground as illustrated in the diagram above. Which of the balls is/are in stable equilibrium?
Question 4 of 50
The length of a simple pendulum is increased by a factor of four. By what factor is its period increased?
Question 5 of 50
The linear expansivity, α, and cubic expansivity, γ, of a material are related by the equation
Question 6 of 50
Which of the illustrated graphs above represents a body moving with uniform retardation?
Question 7 of 50
The correct relationship between the displacement, s, of a particle initially at rest in a linear motion and the time, t, is?
Question 8 of 50
The joule is equivalent to
Question 9 of 50
Which of the following statement(s) is/are correct about a fixed mass of gas compressed in an inexpansible container;
I. The average speed of the molecules increases
II. The temperature of the gas increases
III. The molecules hit the walls of the container more often than before the compression
Question 10 of 50
An example of a mechanical wave is
Question 11 of 50
Which of the following descriptions of the image formed by a plane mirror is not correct. The image is
Question 12 of 50
The efficiency of a wheel and axle is 100% and the ratio of their radii is 5:1.Calculate the effort required to lift a load of mass 20 kg using this machine, [g = 10 m s-2 ]
Question 13 of 50
A freely suspended compass needle on the earth’s surface settles in a plane called
Question 14 of 50
An object is placed at different distances, u, from a converging lens of focal length, 15.0 cm. For what value of u does the lens act as a microscope?
Question 15 of 50
The periodic rise and fall in the intensity of sound produced when two notes of nearly equal frequencies are sounded together is called
Question 16 of 50
The power of the lens is +2.5 D. What is the radius of the curvature?
Question 17 of 50
The reason for having a large number of turns in the coil of a moving coil galvanometer is to
Question 18 of 50
Current is passed through two parallel conductors in the same direction. If the conductors are placed near each other, they will
Question 19 of 50
The period of a 10 kHz radio wave traveling at 3.0 × 108 ms-1 is
Question 20 of 50
The magnetic material produced from the chemical combination of metal oxides and has a very high resistance to electric current is called
Question 21 of 50
A body of mass, M, moving with velocity, V, has a wavelength, X, associated with it. This phenomenon is called
Question 22 of 50
Which of the following statements about a straight current-carrying wire placed in a uniform magnetic field is correct ? The wire experiences
Question 23 of 50
Three cells each of emf , 1.1 V, and internal resistance, 2 Ω, are connected in parallel across a 3 Ω resistor. Determine the current in the resistor.
Question 24 of 50
Which of the following statements about electric potential energy is not correct?
Question 25 of 50
A galvanometer with a full-scale deflection of 20 mA is converted to read 8 V by connecting a 395 Ω resistor in series with it. Determine the internal resistance of the galvanometer.
Question 26 of 50
An inductor of inductance 10 H is connected across an a.c circuit source of 50 V, 100 Hz. What is the current in the circuit? [π = 3.14]
Question 27 of 50
The speed of fast-moving neutrons in a nuclear reactor can be reduced by using
Question 28 of 50
In a series R-L-C circuit at resonance, impedance is
Question 29 of 50
A lamp is rated 240 V, 60 W. Determine the resistance of the lamp when lit.
Question 30 of 50
One major reason why electrical appliances in homes are normally earthed is that the
Question 31 of 50
In doping an intrinsic semiconductor to produce a p-type semiconductor,
Question 32 of 50
Arrange the following radiations in order of increasing ionization of air.
I. Alpha
II. Gamma
III. Beta
Question 33 of 50
If the kinetic energy of an electron is 100 eV, what is the wavelength of the de-Broglie wave associated with it? [h = 6.6 × 10-34 Js, e = 1.6 × 10-19 C, me = 9.1 × 10-31 kg]
Question 34 of 50
Gamma rays are produced when
Question 35 of 50
The half-life of a radioactive substance is 15 hours. If at some instance, the sample has a mass of 512 g, calculate the time it will take \(\frac{7}{8}\) of the sample to decay.
Question 36 of 50
When the direction of vibration of the particles of a medium is perpendicular to the direction of propagation of a wave, the wave is said to be
Question 37 of 50
A hunter fires a gun at a point 408 m away from a cliff. If he hears an echo 2.4 s later, determine the speed of the sound wave
Question 38 of 50
The distance between the fixed points of a mercury-in-glass thermometer is 30 cm. Determine the temperature when the mercury level is 10.5 cm above the lower fixed point
Question 39 of 50
Which of the following statements-about electromagnetic waves is not correct ?
Question 40 of 50
The diameter of a brass ring at 30°C is 50.0 cm. To what temperature must this ring be heated to increase its diameter to 50.29 cm? [ linear expansivity of brass = 1.9 × 10-5 K-1 ]
Question 41 of 50
Which of the following concepts is a method of heat transfer that does not require a material medium?
Question 42 of 50
Which of the following statements about light travelling from one material medium to another is not correct ?
Question 43 of 50
The engine of a car provides a forward force of 1240 N and the total resistive force on the car is 800 N. If the mass of the car is 1220 kg, determine the distance the car has to travel from the rest before acquiring a speed of 4 m s-1 .
Question 44 of 50
A quantity of water at 0°C is heated to 30°C. For each degree rise in temperature, its density will
Question 45 of 50
A small object of mass 50 g is released from a point A . Determine the velocity of the object when it reaches a point B, a vertical distance of 30m below A . [g = 10 ms-2 ]
Question 46 of 50
Molecules move in random motion within a liquid. The total internal energy of the liquid depends on all of the following except its
Question 47 of 50
The viscosity of a fluid depends on the following factors except the
Question 48 of 50
Using venier calipers, which of the following readings gives the correct measurement for the length of a rod?
Question 49 of 50
The basic principle of operation of a beam balance is
Question 50 of 50
In which of the following situations is friction not useful
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