Exam Body

Year

Subject

Paper Type

POST UTME GREENFIELD UNIVERSITY 2021 Physics | Objective

Prepare for your exams with POST UTME GREENFIELD UNIVERSITY questions? Reviewing past/model questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2021 Physics (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1 View Details

A particle of mass $m$ is moving in a circular orbit of radius $r$ under the influence of a central force given by $F(r) = -\frac{k}{r^2}$. If the particle's speed is $v$, what is its angular momentum $L$?

A. mv^2/r

Correct B. mvr

C. mv^2r

D. mv^2/r^2

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 2 View Details

A capacitor consists of two parallel plates, each of area $A$ and separated by a dis\tance $d$. The plates are charged to a potential difference $V$. What is the capaci\tance $C$?

Correct A. \frac{\epsilon_0 A}{d}

B. \frac{\epsilon_0 A}{V}

C. \frac{V}{\epsilon_0 A}

D. \frac{d}{\epsilon_0 A}

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 3 View Details

A sound wave with frequency $f$ and amplitude $A$ is traveling through a medium with speed $v$. What is the wavelength $\lambda$?

Correct A. v/f

B. f/v

C. Av/f

D. v/Af

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 4 View Details

A magnetic field $B$ is directed perp\endicular to a current-carrying wire. What is the direction of the force $F$ on the wire?

Correct A. perp\endicular to the current

B. parallel to the current

C. perp\endicular to the magnetic field

D. parallel to the magnetic field

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 5 View Details

A quantum particle is confined to a one-dimensional box of length $L$. What is the ground-state energy $E_1$?

Correct A. h^2/$ 8mL^2 $

B. h^2/$ 4mL^2 $

C. h^2/$ 2mL^2 $

D. h^2/$ mL^2 $

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 6 View Details

A parallel plate capacitor has plates of area $A$ and separation $d$. If the capaci\tance is $C$, what is the value of the dielectric cons\tant $K$?

Correct A. $ K = \frac{Cd}{epsilon_0 A} $

B. $ K = \frac{epsilon_0 A}{Cd} $

C. $ K = \frac{Cd}{epsilon_0 A} + 1 $

D. $ K = \frac{epsilon_0 A}{Cd} + 1 $

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 7 View Details

A magnetic field is produced by a current-carrying wire. If the current is $I$ and the wire has a radius of $r$, what is the magnitude of the magnetic field at a dis\tance $x$ from the wire?

Correct A. $ B = \frac{mu_0 I}{2 pi x} $

B. $ B = \frac{mu_0 I x}{2 pi r^2} $

C. $ B = \frac{mu_0 I r^2}{2 pi x^2} $

D. $ B = \frac{mu_0 I x^2}{2 pi r^2} $

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 8 View Details

A nucleus has a mass number of $A$ and an atomic number of $Z$. If the nucleus undergoes \beta decay, what is the resulting nucleus?

A. $ A = A + 1, Z = Z + 1 $

Correct B. $ A = A - 1, Z = Z + 1 $

C. $ A = A + 1, Z = Z - 1 $

D. $ A = A - 1, Z = Z - 1 $

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 9 View Details

A gas is heated from $T_1$ to $T_2$. If the initial volume is $V_1$ and the final volume is $V_2$, what is the ratio of the final volume to the initial volume?

Correct A. $ \frac{V_2}{V_1} = \frac{T_2}{T_1} $

B. $ \frac{V_2}{V_1} = \frac{T_1}{T_2} $

C. $ \frac{V_2}{V_1} = \frac{T_2 - T_1}{T_1} $

D. $ \frac{V_2}{V_1} = \frac{T_1 - T_2}{T_2} $

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 10 View Details

A heat engine operates between two temperatures $T_1$ and $T_2$. If the efficiency of the engine is $eta$, what is the ratio of the work done to the heat input?

Correct A. $ \frac{W}{Q} = eta $

B. $ \frac{W}{Q} = 1 - eta $

C. $ \frac{W}{Q} = \frac{T_1 - T_2}{T_1} $

D. $ \frac{W}{Q} = \frac{T_2 - T_1}{T_2} $

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 11 View Details

A particle of mass 2 kg is attached to a spring with spring cons\tant 100 N/m. If the particle is displaced by 0.2 m from its equilibrium position and released from rest, determine the angular frequency of the resulting simple harmonic motion.

A. 10 rad/s

Correct B. 20 rad/s

C. 30 rad/s

D. 40 rad/s

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 12 View Details

A sound wave with frequency 200 Hz and amplitude 0.05 m is traveling through a medium with speed 340 m/s. If the wave is reflected off a rigid boundary, determine the intensity of the reflected wave.

A. 0.1 W/m^2

Correct B. 0.2 W/m^2

C. 0.3 W/m^2

D. 0.4 W/m^2

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 13 View Details

A capacitor consists of two parallel plates, each with area 0.1 m^2 and separated by a dis\tance 0.01 m. If the plates are charged to a potential difference of 10 V, determine the capaci\tance of the capacitor.

Correct A. 0.01 F

B. 0.02 F

C. 0.03 F

D. 0.04 F

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 14 View Details

A circuit consists of a 12 V battery, a 4 Ω resistor, and a 2 H inductor in series. If the circuit is closed at time t = 0, determine the current in the circuit at time t = 2 s.

A. 2 A

B. 3 A

Correct C. 4 A

D. 5 A

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 15 View Details

A block of mass 5 kg is attached to a spring with spring cons\tant 200 N/m. If the block is displaced by 0.1 m from its equilibrium position and released from rest, determine the maximum kinetic energy of the block.

A. 0.5 J

B. 1 J

Correct C. 1.5 J

D. 2 J

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 16 View Details

A beam of light is incident on a glass slab at an angle of 45°. If the re\fractive index of the glass is 1.5, calculate the angle of re\fraction.

Correct A. 30°

B. 45°

C. 60°

D. 75°

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 17 View Details

A radioactive sample has a half-life of 10 years. If the initial activity is 100 Bq, calculate the activity after 20 years.

Correct A. 12.5 Bq

B. 25 Bq

C. 50 Bq

D. 100 Bq

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 18 View Details

A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. If the particle is displaced by 0.5 m from its equilibrium position and released, calculate the maximum kinetic energy of the particle.

A. 0.5 J

Correct B. 1 J

C. 2 J

D. 5 J

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 19 View Details

A sound wave with a frequency of 200 Hz has a speed of 340 m/s. Calculate the wavelength of the sound wave.

A. 1.7 m

Correct B. 1.8 m

C. 2 m

D. 2.1 m

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 20 View Details

A light beam is incident on a prism at an angle of 30°. If the re\fractive index of the prism is 1.5, calculate the angle of deviation.

A. 10°

Correct B. 20°

C. 30°

D. 40°

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 21 View Details

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 experiences a centripetal acceleration of 2 m/s^2, what is the force exerted on the particle?

A. 8 N

Correct B. 16 N

C. 32 N

D. 64 N

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 22 View Details

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?

Correct A. 20°

B. 30°

C. 40°

D. 50°

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 23 View Details

A radioactive sample has a half-life of 5 years. If the initial activity is 100 Bq, what is the activity after 10 years?

Correct A. 12.5 Bq

B. 25 Bq

C. 50 Bq

D. 100 Bq

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 24 View Details

A simple harmonic motion has a maximum displacement of 2 m and a period of 4 s. What is the angular frequency?

A. 1.57 rad/s

Correct B. 3.14 rad/s

C. 6.28 rad/s

D. 12.56 rad/s

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 25 View Details

A light source is placed 2 m away from a convex lens of focal length 0.5 m. If the image dis\tance is 1.5 m, what is the object dis\tance?

A. 0.5 m

B. 1 m

Correct C. 1.5 m

D. 2 m

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

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:

Chat with Support