2011 JAMB Physics Past Questions

The phenomenon that shows that increase in pressure lowers the melting point can be observed in _____.

If the volume of a given mass of gas at 0°C is 27.3 cm³, what will be the volume of the gas at 10°C, pressure remaining constant?

In order to remove the error of parallax when taking measurements with a metre rule, the eye should be focused

Two balls X and Y weighing 5 g and 50 kg respectively were thrown up vertically at the same time with a velocity of 100 ms^-1. How will their positions be one second later?

A man standing on a lift that is descending does not feel any weight because _____?

An object of mass 2 kg moves with a velocity of 10 ms^-1 around a circle of radius 4 m. Calculate the centripetal force on the object.

If it takes an object 3 s to fall freely to the ground from a certain height, what is the distance covered by the object?

If a tube of small radius opened at both ends is placed in a liquid, the liquid will _________.

The value of x, y and z respectively in the expression \( \scriptsize M^xL^yT^z \) for the universal gravitational constant G are _____?

A copper wire was subjected to a tensile stress of 7.7 × 10⁷ Nm^-2. Calculate strain of the wire.

[Young’s modulus = 1.1 × 10¹¹ Nm^-2]

The thermometer whose reading is indicated by a change in colour of its thermometric property is the

The pressure of two moles of an ideal gas at a temperature of 27°C and volume 10^-2 m³ is _______.

[R = 8.313 J mol^-1K^-1]

If the pressure of the vapour on top of an enclosed liquid is equal to the atmospheric pressure, what will be the temperature of the liquid enclosed?

The rise or fall of a liquid in a narrow tube is because of the ____?

I. Change of state
II. Diffusion
III. Radiation
IV. Osmosis

Which of the processes above can be explained using the kinetic theory?

A man standing 2 m from a charcoal fire is warmed mainly by _______.

A length of wire has a frequency of 255 Hz when stretched by a force of 225 N. If the fore increased to 324 N, what is the new frequency of vibration?

A certain far – sighted person cannot see object that are closer to the eye than 50 cm clearly. Determine the power of the converging lens which will enable him to see at 25 cm.

Which of the following electromagnetic waves has the highest frequency?

A cannon is fired from town X. After how long is the sound heard at a town Y, 4.95 km away?

[velocity of sound in the air = 330 ms^-1]

An image in a convex lens is upright and magnified 3 times. If the focal length of the lens is 15 cm, what is the object distance?

The capacitance of a parallel plate capacitor is 20 μf in air and 60 μf in the presence of a dielectric. What is the dielectric constant?

In the circuit above, three resistors, 2 Ω, 4 Ω and 12 Ω, are connected in parallel and a 12 V battery is connected across the combination. The current flowing through the 12 Ω resistor is

If the charge of electricity in kWh is ₦4, what is the cost of operating an electrical appliance rated 250 V, 2 A for six hours?

The correct expression for the potential at a point distance r from a charge q in an electric field is

Which of the following will be applied when a metal Y is used to electroplate another metal X in electrolysis?

Three similar cells, each of e.m.f 2 V and internal resistance 2 Ω are connected in parallel; the total e.m.f and total internal resistance are, respectively, _______.

In Homes, electrical appliances and lamps are connected in parallel because

Two resistors 5 Ω and 10 Ω are arranged first in series and later in parallel to a 24 V source, the ratio of total power dissipated in the series and parallel arrangements respectively is

A radioactive isotope has a decay constant of 10^-6 s^-1. Calculate its half – life?

If the threshold frequency for tungsten is 1.3 × 10¹⁵ Hz, what is its work function?

[H = 6.6 × 10^-34 Js]

Two inductors of inductances 4 H and 8 H are arranged in series and current of 10 A is passed through them. What is the energy stored in them?

Under which of the following conditions do gases conduct electricity?

In measuring high frequency a.c., the instrument used is the

The bond between silicon and germanium is

Which of the following materials has an increase in resistance with temperature?

The electrical properties of germanium can be altered drastically by the addition of impurities. This process is referred to as

Which of the following could be effectively used to reduce friction?

The diagrams above show the positions of a cone. The position which can be described as neutral equilibrium, is represented as

The diagram above shows two vectors at right angles to each other. The value of the resultant vector is _____?

I.       High thermal capacity
II.     High sensitivity
III.    Easy readability
IV.     Accuracy over a wide range of temperatures

From the statements above, the qualities of a good thermometer are

A block of aluminum is heated electrically by a 30 W heater. If the temperature rises by 10°C in 5 minutes, the heat capacity of the aluminum is

A plastic sphere floats in water with 50% of its volume submerged. if it floats in glycerine with 40% of its volume submerged,the density of the glycerine is?

At 4°C, the volume of fixed mass of water is _____.

An electric heater rated 220 V, 1000 W is immersed into a bucket full of water, calculate the mass of water if the temperature changes from 30°C to 100°C and the current flows for 300 seconds.

[specific heat capacity of water = 4200 jkg^-1 K^-1]

The mechanism of heat transfer from one point to another through the vibration of the molecules of the medium is _____.

When the human eye loses its power of accommodation, the defect is known as_____.