UTME 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A convex mirror is used as a driving mirror because I. Its image is erect II. It has a large field of view III. It has a long focal length. Identify the CORRECT statement(s).
A. I and III only
B. I and II only
C. II and III only
D. I, II and III only
E. I only
Question 2
Consider the three forces acting at O and in equilibrium as shown in Fig. 5. Which of the following equations is/are CORRECT? I. \( P_{1} \, \cos \, \theta_{1}=P_{1} \, \cos \, \theta_{2} \quad \) II. \( P_{3}=P_{1} \cos \theta_{1}+P_{2} \cos \theta_{2} \) III. \( P_{1} \sin \theta_{1}=P_{2} \sin \theta_{2} \)
A. I only
B. II only
C. III only
D. I, II and III only
Question 3
Which of the following statements about defects of vision is/are CORRECT? I. For a long sighted person, close objects appear blurred. II. For a short sighted person, distant objects appear blurred. III. Short sight is corrected by using a pair of converging lenses.
A. I only
B. II only
C. I and II only
D. II and III only
Question 4
A machine gun with a mass of 5 kg fires a 50 g bullet at a speed of 100 \( ms^{-1} \). The recoil speed of the machine gun is
A. \( 0.5 m s^{-1} \)
B. \( 1.5 m s^{-1} \)
C. \( 1 m s^{-1} \)
D. \( 2 ms^{-1} \)
Question 5
The force required to make an object of mass m, travelling with velocity v, turn in a circle of radius r is
A. \( \frac{m v^{2}}{r} \)
B. \( \frac{m r^{2}}{r} \)
C. \( \frac{\mathrm{mr}}{\mathrm{v}} \)
D. \( \frac{m v}{r^{2}} \)
Question 6
A solid weighs 4.8 g in air, 2.8 g in water and 3.2 g in kerosine. The ratio of density of the solid to that of the kerosine is
A. 2
B. \( \frac{3}{2} \)
C. \( \frac{2}{3} \)
D. 3
Question 7
When a sound wave passes from air into water its
A. speed and frequency increase but its wavelength remains the same
B. speed and wavelength increase but its frequency remains the same
C. speed decreases
D. speed increases but its frequency and wavelength decrease
Question 8
A magnetic needle is suspended first at the earth's north magnetic pole and then at a point on the magnetic equator. The respective angles between the needle and the horizontal are
A. \( 0^{\circ} \) and \( 0^{\circ} \)
B. \( 60^{\circ} \) and \( 60^{\circ} \)
C. \( 90^{\circ} \) and \( 90^{\circ} \)
D. \( 90^{\circ} \) and \( 0^{\circ} \)
Question 9
A few grains of table salt were put in a cup of cold water, kept at constant temperature and left undisturbed. Eventually all the water tasted salty. This action is due to
A. convection
B. osmosis
C. capillarity
D. diffusion
Question 10
Natural radioactivity consists of the emission of
A. \( \alpha \)-particles and \( \beta\)-rays
B. \( \alpha \)-particles and X-rays
C. \( \gamma \)-rays and X-rays
D. \( \alpha \)-particles, \( \beta \)-rays and \( \gamma \)-rays
Question 11
The mass of a proton is approximately equal to that of
A. an \( \alpha \)-particle
B. a \( \beta \)-particle
C. a neutron
D. an electron
Question 12
In the above diagram MN is perpendicular to ON and MP. What is the difference between the moment about N of the force of 20 newtons applied along MP and its moment about O?
A. Zero
B. 0.2 N m
C. 0.4 N m
D. 0.8 N m
Question 13
Which of the following instruments consumes the highest current?$$\begin{array}{|l|l|l|} \hline \mathbf{Instruments} & \mathbf{Voltage\ Rating} & \mathbf{Power\ Rating} \\ \hline \text{A. Electric iron} & 250\text{V} & 1\text{kW} \\ \hline \text{B. Television set} & 220\text{V} & 110\text{W} \\ \hline \text{C. Torch light} & 6\text{V} & 30\text{W} \\ \hline \text{D. Immersion heater} & 110\text{V} & 500\text{W} \\ \hline \end{array}$$
A. Electric iron
B. Television set
C. Torch light
D. Immersion heater
Question 14
In which of the following diagrams is the length of the tube equal to one wavelength?
Question 15
The effect of closing the key K in the circuit shown in Fig. 1 would be to
A. increase the current by 0.4 A
B. reduce the current by 0.4 A
C. increase the current by 0.6 A
D. reduce the current by 0.6 A

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