UTME 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In an experiment in which molten naphthalene is allowed to cool, the cooling curve in Figure 7. was obtained. The temperature \( 80^{\circ} \mathrm{C} \) is known as the
A. cooling temperature
B. boiling point
C. melting point
D. vaporization point
Question 2
In which of the following diagrams is the length of the tube equal to one wavelength?
Question 3
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 4
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 5
Which of the following statements about radioactivity is true? \( i. \) Alpha particle is positively charged \( ii. \) Beta Particle is negatively charged \( iii. \) Gamma Ray is nuetral \( iv. \) Beta particle has the same mass as helium atom \( v. \) Gamma Ray is charged
A. i, ii, iii, iv only
B. i, ii, iii only
C. iv and v only
D. i, ii and v only
Question 6
Which of the following statements on the use of X-rays is incorrect? X-rays are used
A. In hospitals to obtain photographs of tissues and bones in the body
B. In detecting fingerprints
C. To reveal hidden flaws in metal castings and welded joints
D. In works of art
Question 7
A substance has a half-life of 3 min. After 6 min, the count rate was observed to be 400. What was its count rate at zero time?
A. 1600
B. 1200
C. 200
D. 2400
Question 8
What is the cost of running five 50 W lamps and four 100 W lamps for 10 hours if electrical energy costs 2 kobo per kWh?
A. N0. 65
B. N 0.39
C. N3.90
D. N0.13
Question 9
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 10
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 11
A transformer has 300 turns of wire in the primary coil and 30 turns in the secondary coil. If the input voltage is 100 volts, the output voltage is
A. 5 volts
B. 10 volts
C. 15 volts
D. 20 volts
Question 12
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 13
In Fig. 8, the value of \( R \) is
A. 3\Omega
B. 6\Omega
C. 4IOmega
D. 5\Omega
Question 14
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 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

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: