UTME CBT FREE Practice Test – Physics

A bar magnet is placed near and lying along the axis of a solenoid connected to a galvanometer. The pointer of the galvanometer shows no deflection when

A. the magnet is moved away from the stationary solenoid
B. the solenoid is moved away from the stationary magnet
C. the magnet is moved towards the stationary solenoid
D. there is no relative motion between the magnet and the solenoid.

A tugboat is travelling from Asaba to Onitsha across the River Niger with a resultant velocity of 20 knots. If the river flows at 12 knots, the direction of motion of the boat relative to the direction of water flow is _______ 

A. 36.87°      B. 53.13°      C. 90°      D. 136.87°

The energy required to change a solid to liquid at constant temperature is called

A. thermal capacity     B. specific heat capacity     C. latent heat of fusion     D. latent heat of vaporisation

Which of the following statements is correct? The reading of pressure on a mercury barometer is independent of ______

A. the cross-sectional area of the tube
B. the atmospheric pressure
C. the density of mercury
D. the temperature of mercury

A concave lens of focal length 20cm forms an image the size of the object. The object distance is ______

A. 100 cm     B. cm     C. 60 cm    D. cm

The diagram shows a maximum and minimum thermometer divided into three portions P, Q and R. Which of the following is true about the respective contents of P, Q and R?

A. Alcohol, mecury and alcohol
B. Air, alcohol and mercury
C. Mecury, alcohol and mecury
D. Air, mecury and alcohol

The frequency of a swinging pendulum is the

A. number of complete oscillations the pendulum makes in one second.
B. number of amplitudes the bob makes in one second
C. angle the bob swings through in one second
D. distance the bob covers in one second

The terrestrial telescope has one extra lens more than the astronomical telescope. The extra lens is for ____

A. improving the sharpness
B. creating an inverted image
C. magnification of the image
D. erection of the image

In the series a.c. circuit shown, the p.d. across the inductor is 8 r.m.s and that across the resistor is 6 V r.m.s. The effective voltage is

A. 2 V    B. 10 V    C. 14 V    D. 48 V

Which of the following elements is the best absorber of X-rays?  

A. Hydrogen    B. Oxygen   C. Calcium    D. Lead

The design of the thermostat of an electric Iron is based on the

A. emission of electrone from metals when heated
B. Increase in size of metals when heated
C. Increase in the density of metals when heated
D. change in the mass of metals when heated.

Which of the following quantities has the same unit as energy?

A. Power    B. Work    C. Force    D. Momentum

A working electric motor takes a current of 1.5 A when the p.d. across it is 250 V. If its efficiency is 80%, the power output is ____

A. 300.0 W   B. 469.0 W   C. 133.0 W   D. 4.8 W

An electric motor is a machine that converts

A. mechanical energy into electrical energy
B. electrical energy into mechanical energy
C. high voltage to low voltage
D. low voltage to high voltage.

The lowest note emitted by a stretched string has a frequency of 40 Hz. How many overtones are there between 40 Hz and 180 Hz?

A. 4      B. 3      C. 2      D. 1

In the Rutherford scattering experiment, a beam of alpha particles was fired at a thin gold film with some of the particles being considerably deflected. This shows that ______

A. A gold nucleus contains protons, neutrons and electrons uniformly distributed in a tiny volume.
B. The gold nucleus is positively charged and is concentrated in a tiny volume
C. The gold nucleus emitted alpha particles
D. The gold nucleus is concentrated in a tiny volume and contains alpha particles

Which of the following statements defines correctly the efficiency of a machine?

A. The load carried by the machine divided by effort required in carrying the load
B. The distance moved by the load divided by the distance moved by the effort
C. The useful work done by the machine divided by the total work put into it.
D. The movement of the load divided by the movement of the effort about the same point

A pressure cooker saves both time and fuel in cooking because inside the cooker, the ______ 

A. boiling point of water ¡s raised
B. pressure ¡s constant
C. heat is completely trapped
D. temperature is evenly distributed

When a ship sails from salt water into fresh water, the fraction of its volume above the water surface will _____

A. remain the same    B. increase    C. decrease    D. increase then decrease

I. A liquid boils when its saturated vapour pressure is equal to the external pressure
II. Dissolved substances in pure water lead to increase in the boiling point.
III. When the external pressure is increased, the boiling point increases.
IV. Dissolved substances in pure water decreases the boiling point.

Which combination of the above are peculiarities of the boiling point of a liquid?

A. I, II and III      B. I, II, III and IV      C. I, II, IV      D. II, III and IV

A heater marked 50W will evaporate 0.005kg of boiling water ¡n 50 seconds. The specific latent heat of vaporization of water in J/kg is _______ 

A. 5.0 x 10⁶   B. 1.0 x 10⁶   C. 2.5 x 10⁶   D. 5.0 x 10⁵

A radioactive element has a decay constant of 0.077s^-1. Calculate its half-life.

A. 13.0 s    B. 9.0 s    C. 5.1 s    D. 0.5 s

If the force and the velocity on a system are each reduced simultaneously by half, the power of the system is ______

A. double    B. constant    C. reduced to a quarter    D. reduced by half

When the temperature of a liquid is increased, its surface tension

A. decreases   B. increases    C. remains constant    D. increases then decreases.

The mass attached to a string is moving in a circular path. If the speed is doubled, the tension in the string will be

A. doubled    B. halved    C. four times is great    D. one-fourth as much.

Which of the following is a unit of the time rate of flow of electric charges?

A. Coulomb    B. Ampere    C. Volt    D. Watt

If the wavelength of a wave travelling with a velocity of 360 ms-1 is 60 cm, the period of the wave is ____

A. 6s    B. 3.6s    C. 017s    D. 0.61s

In the above diagram a straight vertical wire is placed between two opposite magnetic poles which are separated horizontally by a short distance. If a current is passed down the wire, in which direction will the wire move?  

A. Towards the observer
B. Away from the observer
C. Toward the North pole
D. Towards the South pole

Which of the following equations for the efficiency of a machine is correct

A.

B.

C.

D.

A 10 g mass placed on the pan of a spring balance causes an extension of 5 cm. If a 15 g mass is placed on the pan of the same spring balance the extension is _____ 

A. 3.3 cm   B. 6.5 cm    C. 7.5 cm   D. 10.8 cm

The ratio of the linear expansivity of copper to that of iron is approximately 1.5. A specimen of iron and a specimen of copper expand by the same amount per unit rise in temperature. The ratio of their lengths is ______ 

A. 3    B. 1.5    C. 1.32    D. 0.67

One end of a long wire is fixed while a vibrator attached to the other end. When the vibrator is energized, the types of waves generated in the wire are ______

A. stationary and transverse
B. progressive and transverse
C. stationary and longitudinal
D. progressive and longitudinal

A converging lens and a screen are placed 20 cm and 80 cm respectively from an object in a straight line so that a sharp image of the object is formed on the screen. If the object is 3 cm high, calculate the height of the image formed.

A. 1 cm    B. 9 cm    C. 12 cm    D. 15 cm

The magnetic flux in a coil having 200 turns changes at the time rate of 0.08 Wbs^-1. The induced e.m.f in the coil is _____

A. 1.6 V    B. 16.0 V    C. 25.0 V    D. 250.0 V

A 3000 W electric cooker is to be used on a 200 V mains circuit. Which of the fuses below can be used safely with the cooker?

A. 2 A   B. 5 A    C. 10 A    D. 15 A

The name given to the characteristic behaviour of substances which set their length perpendicular to a strong magnetic field instead of in line with it is ______

A. magnetisation.    B. paramagnetism    C. diamagnetism   D. demagnetization

All the heat generated in a 5 ohm resistor by 2 A flowing for 30. seconds is used to evaporate 5 g of a liquid at its boiling point. Which of the following is the correct value of the specific latent heat of the liquid?

A. 120 J     B. 60 Jg^-1     C. 120 Jg^-1     D. 1500J

A body is released from rest and allowed to fall freely from a given height under gravity. The kinetic energy at its half-way point is ______

A. a little above half of ifs initial energy
B. a little below half of its initial energy
C. a half of its initial energy
D. a little above its initial energy

A cell has an open circuit voltage V₁ and a closed circuit voltage V₂ when a current I is flowing through it. Therefore, the internal resistance of the cell is ______

A.      B.      C.       D.

A conductor of length 2 m carries a current of 0.8 A while kept in magnetic field of magnetic flux density 0.5 T. The maximum force acting on it is ___

A. 8.0 N   B. 3.2 N    C. 0.8 N    D. 0.2 N