# NECO Physics Questions and Answers 2020/2021 |OBJ & Theory Expo

Let me start by telling you a bit about our NECO physics answers 2020 and where these NECO physics questions 2020 are set from.

The NECO 2020 questions and answers for physics are set from SS1 to SS3 scheme of work. All the topics that this 2020 NECO physics theory and OBJ questions are set from are in the physics syllabus.

Meanwhile, the samples of some of the Physics questions and answers for NECO 2020 and how there are solved are the expo that you will see on this page.

Again, keep refreshing this page because the actual physics theory and OBJ questions and answers for this year’s NECO exam l might be posted on this page any moment from now.

## Quick NECO Physics OBJ answers 2020 to Sample Questions

These are quick samples of NECO Physics OBJ questions 2020 and their correct answers to practice with. Try these questions by yourself and make sure you can solve them correctly.

Also, try answering other physics questions using the same methods below were applicable. 1. Calculate the distance covered by a car that travels at an average speed of 100kmh-1 in 5minutes.

1. 500km
2. 8.3kmh-1
3. 500kmh-1
4. 30,000km
5. 8.3km

The correct answer is E. 8.3km. See the solution in the No.1 question in the theory section.

2. Which of the following is not a type of motion?

1. Random motion
2. Relative motion
3. Translational motion
4. Rotational motion
5. Oscillatory

The correct answer is B. Relative motion

3. The S.I unit of the moment of a force is___?

1. Kgm-1
2. Nm
3. Jm-1
4. Nm-1
5. Nmm-1

The correct answer is B. Nm

4. A stationary ball is hit by an average force of 50N for a time range of 0.03sec. Calculate the impulse experienced by the ball.

1. 1.5N-sec
2. 0.0006N-sec
3. 1666N-sec
4. 1.5sec
5. 5.1N-sec

The correct answer is A. 1.5N-sec

5. ___________ is the change of position of a body with time?

1. Gravity
2. Friction
3. Force
4. Motion
5. Distance.

The correct answer is D. Motion

6. A body of mass 3.0kg moves with a velocity of 10ms-1. Calculate the momentum of the body.

1. 30.0Nms-1
2. 30.0kgNs-1
3. 30.0kgms-1
4. 30.0mms-1
5. 30.0kms-1

The correct answer is C. 30.0kgms-1.

7. Calculate the acceleration of an unbalanced force of 20N acts on a 4.0kg mass.

1. 5ms-1.
2. 6ms-1.
3. 5Ns-1.
4. 5mms-1.
5. 5kgms-1.

The correct answer is A. 5ms-1.

8. A rocket is burning fuel at the rate of 200gs-1 and ejecting all the gas in one direction at the rate of 400ms-1. What is the maximum weight the rocket can have if it is going to move vertically upwards?

1. 60N
2. 0.5N
3. 2N
4. 80N
5. 80Ns-1

The correct answer is D. 80N. See the solution in the theory section

9. What are the magnitudes of two Forces (Force A & B) acting at a point at right angles, if their resultant force is 50N and their summed force 70N?

1. 50N and 20N
2. 40N and 30N
3. 45N and 25N
4. 20N and 40N
5. 60N and 10N

10. If a band is played on the moon, the sound will_____________?

1. reverberate
2. be heard by us faintly
3. be heard up to 10km from it
4. not be heard at any distance at all from it

The correct answer is D) not be heard at any distance at all from it

## Solved Answers to NECO Theory Questions 2020 Samples

Some of the OBJ questions above have been completely solved in this NECO physics theory sample questions answers section.

So, follow the steps below and see how each of the questions is solved. Take note of the steps used in solving them.

1. Calculate the distance covered by a car that travels at an average speed of 100kmh-1 in 5minutes.

Solving the solution to question one:

Firstly, convert the speed from kmh-1 to km per minute since the time is in minutes. Thus; 100km per hour = 100/60km per minute.

The formula: Speed = distance/time, but make distance the subject of the formula since we are calculating for distance. Therefore, Distance = speed X time

= 100/60 x 5 = 8.3km Ans.

2. Calculate the acceleration of an unbalanced force of 20N acts on a 4.0kg mass.

Solving the solution to question two:

Formula; F = ma

Where F =20N, and M=4.0kg; therefore 20N = 4a; 20/4 = 4/4

Making “a” the subject of the formula, we have; a = 5ms-1 Ans.

3. A body of mass 3.0kg moves with a velocity of 10ms-1. Calculate the momentum of the body.

Solution:

P=mv

=3 x 10

30.0kgms-1

Important Physics Formulas and Terminologies

• Speed = distance/time
• Velocity = displacement/time
• Acceleration = Change in velocity/time taken for the change

Try the following questions by yourself:

1. Define Kinetic energy and give its formula.
2. What is boiling
3. Give the boiling points of the following liquids;
• Water
• Alcohol
1. When is work said to be done?
2. Calculate the work done by a man who pushes a load of mass 50kg, through a plane incline at 300 to the ground over a distance of 12m [Take the force of gravity (g)=10m/s2

## NECO Past Questions and Answers for Physics 2020

The following are sample questions gotten from past questions. Study and take note of their answers in case you come across similar questions in the exam.

1. Which of the following describes the working principle of a washing machine?

1. reverse osmosis
2. diffusion
3. centrifugation
4. dialysis

The correct answer is C) centrifugation 2. The Unit at which Nuclear sizes are expressed is known as _____?

1. Fermi
2. Angstrom
3. Newton
4. Tesla

The correct answer is A), Fermi

3. In which of this medium will the speed of light be minimum When passing through?

1. water
2. vacuum
3. Air
4. Glass

The correct answer is: D) Glass

4. All the following are vector quantities, Except_______?

1. speed
2. velocity
3. torque
4. displacement

The correct answer is A) speed

5. Which of the following will an Air bubble in water act like?

1. convex lens
2. convex mirror
3. concave lens
4. concave mirror

The Correct Answer is C) concave lens

6. Which of the bulbs will fuse if Two electric bulbs say 25W – 220V & 100W – 220V are connected in series to a 440V power supply?

1. 25 W
2. Both
3. 100 W
4. Neither

The correct answer is A) 25 W

7. Why is the core of an electromagnet made of soft iron____? because it has:

1. small susceptibility and small retentivity
2. large susceptibility and small retentivity
3. large density and large retentivity
4. small density and large retentivity

The correct answer is B) large susceptibility and small retentivity

8. Which of the following Term are the Masses of stars and galaxies usually expressed?

1. neutron mass
2. earth’s mass
3. solar mass
4. lunar mass

The Correct Answer is C) Solar Mass

9. Which of the following effects governs the working of the quartz crystal in the watch?

1. Piezoelectric Effect
2. Edison Effect
3. Photoelectric Effect
4. Johnson Effect

Correct Answer is A) Piezoelectric Effect

I am glad this material was useful to you. Proper use of these quick samples of NECO Physics questions 2020 and the correct NECO physics answers 2020 as shown above to practice with will help you a lot in this exam.

These are not the actual Questions that you will see in the NECO Physics Exam paper. But they are questions that may likely be repeated.