2015 JAMB Physics Past Questions CBT

A satellite moves in a circular orbit of radius 4R round the earth. The acceleration of the satellite in terms of g is

In the diagram below, the direction of the force between N and S in the magnetic field is

Calculate the inductance of a coil of resistance 30 Ω connected to a 100 V a.c source if the coil draws an r.m.s current of 2 A. The coil is connected with 100 V, \(\frac{50}{\pi}\) Hz frequency ac source.

What force has to be exerted on a mass 60 kg to give it an acceleration of 10 ms^-2 vertically upwards?

[g = 10 ms^-2]

A satellite revolving around the earth is kept on its orbit by

The plates of a 0.5 µF unchanged capacitor are connected to a 10 V battery. The charge on the capacitor after a long time is

If a document is to be produced using a duplicating camera, where should the document be placed in order to obtain an exact copy?

The efficiency of a machine is 70%. Calculate the work done using this machine to raise a load of 10 kg through a vertical height of 2.0 m.

[g = 10ms^-2]

Which of the following statements is not true about an atom?

A current of 20 A flows through a cable whose resistance is 5 Ω. Calculate the electric power dissipated.

From the diagram below, the equivalent capacitance of the three capacitors is

Calculate the temperature of 6 moles of an ideal gas at a pressure of 7.6 × 10⁶ Nm^-2 with a volume of 10^-3 m³.

[R = 8.3 J mol^-1 K^-1]

A piece of cork floats in water because

A block of aluminum of mass is heated electrically by a 25 W heater. If the temperature rises by 10ºC in 5 minutes. Calculate the heat capacity of the aluminum.

In the diagram below, the charges on X and Y are the opposite. What happens when they are in contact

If the speed of light in water is 2.26 × 10⁸ ms^-1 and the velocity of light in air is 3.0 × 10⁸ ms^-1. Calculate the refractive index of water.

I. Thermometer must be kept vertical
II. Top of the mercury meniscus is read
III. Air used must be dry

Which of the following precautions are common in verification of Boyle’s law?

Which of the following does not use the magnetic effect of current to function?

What are the charge carriers in semiconductors?

When a capacitor is charged to 20 C on each plate the energy stored by it is 40 J, at what charges will it store half of this energy?

What is the energy with which an incident light of wavelength 10^-7 m falls on metal and electrons are emitted?

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

A progressive wave is represented by y = \( \scriptsize 10Sin \left(1000\pi t\; – \; \normalsize \frac{\pi x}{34} \right)\)

Two layers of the wave separated by 153 cm have a phase difference of

A 100 kg box is pushed along a road with a force of 500 N. If the box moves with a uniform velocity, the coefficient of friction between the box and the road is

[g = 10ms^-2]

From the generating station to each substation power is transmitted at a very high voltage so as to reduce

Which of the velocity-time graphs shows the uniform acceleration of the body from rest?

An empty relative density bottle has a mass of 30 g. When filled with paraffin, its mass is 70 g. Calculate the mass of the bottle when it is filled with water

[relative density of paraffin = 0.8]

A projectile is fired from the ground level with a velocity of 300 ms^-1 at an angle of 30° to the horizontal. Calculate the time taken to reach the maximum height [g = 10 ms^-2]

An electric bulb is labeled 260 V, 80 W. How much current is taken by the bulb?

A meter rule is pivoted at its mid-point with a vertical force of 10 N hanging from the distance 30cm from the mid-point. At what distance must a 15 N force hang to balance the ruler horizontally?

What type of reaction is represented by the equation below?

\(\scriptsize ^{2}_{1}X \: + \: ^{2}_{1}X \: \rightarrow \: ^{3}_{2}Y\: + \: ^{1}_{0}n\: + \: Energy \)

Calculate the period of vibration of a spring system of force constant 200 Nm^-1 when loaded with a mass of 2 kg.

From the diagram below, the measuring accuracy of the micrometer screw gauge is

The impulse of a force is deducted from Newton’s second law as

A charged particle is moving in a uniform magnetic field. If the direction of motion of the charged particle is parallel to the magnetic field, the path of the charged particle will

Which of the following is not affected by friction in machine?

Which of the following is both transverse and mechanical?

Which of the following is a semiconducting material?

Chemical energy is used to power which of the following?

When primary and secondary colors are combined to produce white light, the phenomenon is known as

In the diagram above, at terminal velocity, the three forces are related by the expression.

The different time rates of flow of fluid is due to

If a current of 4.6 A was passed through a wire of resistance of 6.5 Ω, the potential difference across the wire is

In the diagram above, the neutral point is at

Which of the following does not affect frictional force?

Which of the following does not affect an application of expansion in metals?

Vapour is said to be saturated on top of an enclosed liquid if

A body which weighs 50 N in the air displaces 3.7 kg of water when partially immersed in water. Calculate the upthrust on the body

(g = 10 ms^-2 )

If the distance between the object and the pinhole camera is reduced by half, the size of the image of the object

A train with an initial velocity of 20 ms^-1 is subjected to a uniform deceleration of 2 ms^-2. The time required to bring the train to a complete halt