POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2023 Physics | Objective

Are you preparing for POST UTME JOSEPH AYO BABALOLA UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2023 Physics (Objective) questions designed to simulate the real exam environment.

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Question 1
A particle of mass $m$ is confined to a one-dimensional box of length $L$. If the particle is in the ground state, what is the expectation value of its position?
Correct A. $\frac{L}{2}$
B. $\frac{L}{4}$
C. $\frac{3L}{4}$
D. $\frac{L}{\sqrt{2}}$

Correct Answer: A

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Question 2
A circuit consists of a $10\Omega$ resistor, a $20\Omega$ resistor, and a $5\Omega$ resistor connected in series. If a voltage of $12\text{V}$ is applied across the circuit, what is the current through the $5\Omega$ resistor?
Correct A. $\frac{12}{35}\text{A}$
B. $\frac{12}{25}\text{A}$
C. $\frac{12}{45}\text{A}$
D. $\frac{12}{55}\text{A}$

Correct Answer: A

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Question 3
A radioactive sample has a half-life of $10\text{years}$. If the initial activity is $100\text{Bq}$, what is the activity after $20\text{years}$?
A. $50\text{Bq}$
B. $25\text{Bq}$
C. $12.5\text{Bq}$
Correct D. $6.25\text{Bq}$

Correct Answer: D

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Question 4
A particle of mass $m$ is moving in a circular path of radius $r$ with a cons\tant speed $v$. If the particle is subject to a centripetal force $F_c$, what is the magnitude of the force?
Correct A. $\frac{mv^2}{r}$
B. $\frac{mv}{r}$
C. $\frac{m}{r}$
D. $\frac{r}{m}$

Correct Answer: A

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Question 5
A projectile is launched from the ground with an initial velocity of $20\text{m/s}$ at an angle of $30^\circ$ above the horizontal. If the air resis\tance is negligible, what is the maximum height reached by the projectile?
A. $10\text{m}$
B. $15\text{m}$
Correct C. $20\text{m}$
D. $25\text{m}$

Correct Answer: C

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Question 6
A 2-pole, 4-wire, star-connected alternator has an induced emf of 220 V. If the frequency of the supply is 50 Hz, calculate the value of the current drawn from the alternator.
A. 4 A
Correct B. 8 A
C. 10 A
D. 12 A

Correct Answer: B

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Question 7
A body of mass 5 kg is moving with a velocity of 10 m/s. If it is subjected to a force of 20 N, calculate the acceleration produced in the body.
A. 2 m/s^2
B. 4 m/s^2
Correct C. 6 m/s^2
D. 8 m/s^2

Correct Answer: C

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Question 8
A particle is moving in a circular path of radius 10 m with a cons\tant speed of 20 m/s. Calculate the magnitude of the acceleration of the particle.
A. 2 m/s^2
B. 4 m/s^2
Correct C. 6 m/s^2
D. 8 m/s^2

Correct Answer: C

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Question 9
A capacitor of capaci\tance 10 μF is connected across a 200 V supply. Calculate the charge stored in the capacitor.
A. 2 C
Correct B. 4 C
C. 6 C
D. 8 C

Correct Answer: B

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Question 10
A body of mass 10 kg is moving with a velocity of 20 m/s. If it is subjected to a force of 30 N, calculate the acceleration produced in the body.
A. 3 m/s^2
B. 6 m/s^2
Correct C. 9 m/s^2
D. 12 m/s^2

Correct Answer: C

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Question 11
A particle of mass 2 kg is moving in a circular path of radius 3 m with a cons\tant speed of 4 m/s. If the particle is subjected to a centripetal acceleration of 2 m/s^2, what is the magnitude of the net force acting on the particle?
A. 10 N
B. 12 N
Correct C. 16 N
D. 20 N

Correct Answer: C

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Question 12
A ray of light passes from air into a glass block with a re\fractive index of 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 20°
Correct B. 25°
C. 30°
D. 35°

Correct Answer: B

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Question 13
A gas is heated from 300 K to 400 K at cons\tant volume. If the initial pressure is 2 atm, what is the final pressure?
A. 1.5 atm
Correct B. 2.5 atm
C. 3.5 atm
D. 4.5 atm

Correct Answer: B

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Question 14
A particle of mass 1 kg is moving in a straight line with a velocity of 5 m/s. If the particle is subjected to a force of 10 N, what is the acceleration of the particle?
A. 0.5 m/s^2
B. 1 m/s^2
Correct C. 2 m/s^2
D. 5 m/s^2

Correct Answer: C

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Question 15
A light source is placed 2 m away from a convex lens with a focal length of 0.5 m. If the light source is moved 1 m closer to the lens, what is the new image dis\tance?
A. 1.5 m
B. 2 m
Correct C. 2.5 m
D. 3 m

Correct Answer: C

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Question 16
A particle of mass 2 kg is moving in a circular path of radius 3 m with a cons\tant speed of 4 m/s. If the particle is subjected to a centripetal force of 12 N, what is the angular velocity of the particle?
A. 2 rad/s
B. 4 rad/s
Correct C. 6 rad/s
D. 8 rad/s

Correct Answer: C

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Question 17
A light ray passes from air into a glass slab of re\fractive index 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 20°
Correct B. 25°
C. 30°
D. 35°

Correct Answer: B

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Question 18
A simple harmonic motion is described by the equation x(t) = 2 \sin\( 3t + π/4 \). What is the amplitude of the motion?
Correct A. 2 m
B. 4 m
C. 6 m
D. 8 m

Correct Answer: A

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Question 19
A body of mass 5 kg is moving with a velocity of 10 m/s. If it is subjected to a force of 20 N, what is the acceleration of the body?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
Correct D. 8 m/s^2

Correct Answer: D

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Question 20
A light source is placed 2 m away from a convex lens of focal length 1 m. If the light source is moved 1 m closer to the lens, what is the new image dis\tance?
A. 1 m
B. 2 m
Correct C. 3 m
D. 4 m

Correct Answer: C

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Question 21
A point charge of +2 μC is placed at the origin of a coordinate system. A second point charge of -3 μC is placed at a dis\tance of 0.5 m from the origin. What is the magnitude of the electric field at a point 0.2 m from the origin, on the line connecting the two charges?
A. 0.5 N/C
B. 1.0 N/C
Correct C. 1.5 N/C
D. 2.0 N/C

Correct Answer: C

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Question 22
A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length -15 cm. What is the focal length of the combination?
A. 10 cm
Correct B. 15 cm
C. 20 cm
D. 30 cm

Correct Answer: B

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Question 23
A particle of mass 2 kg is moving in a circular path of radius 3 m with a cons\tant speed of 4 m/s. What is the magnitude of the centripetal acceleration?
A. 0.5 m/s^2
B. 1.0 m/s^2
Correct C. 1.5 m/s^2
D. 2.0 m/s^2

Correct Answer: C

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Question 24
A wave with a frequency of 50 Hz and a wavelength of 2 m is traveling through a medium. What is the speed of the wave?
A. 1000 m/s
Correct B. 2000 m/s
C. 2500 m/s
D. 3000 m/s

Correct Answer: B

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Question 25
A force of 10 N is applied to an object of mass 2 kg. What is the acceleration of the object?
A. 0.5 m/s^2
Correct B. 1.0 m/s^2
C. 1.5 m/s^2
D. 2.0 m/s^2

Correct Answer: B

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