# 2012 JAMB Physics Past Questions & Answers - page 1

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1
In order to remove the error of parallax when talking measurements with a metre rule, the eye should be focused

A slantingly towards the right on the markings

B slantingly towards the left on the markings

C vertically downwards on the markings

D vertically upwards on the markings

**Correct Option:** C

2
A load is pulled at a uniform speed along a horizontal floor by a rope at 45

^{o}to floor. If the force in the rope is 1500N, what is the frictional force on the load ?
A 1524N

B 1350N

C 1260N

D 1061N

**Correct Option:** D

**Solution**

^{o}= 1500 x 0.708

3
Calculate the total distance covered by a train before coming to rest if its initial speed is 30ms

^{-1}with a constant retardation of 0.1m^{-2}
A 5500m

B 4500m

C 4200m

D 3000m

**Correct Option:** B

**Solution**

S = \(\frac{0^2 - 30^2}{2 \times 0.1}\)

4
A car starts from rest and moves with a uniform acceleration of 30ms

^{-2}for 20s. Calculate the distance covered at the end of the motion
A 6km

B 12km

C 18km

D 24km

**Correct Option:** A

**Solution**

S = \(0 \times 2 + \frac{1}{2} \times 30 \times 20^2\)

5
A rocket is fired from the earth's surface to a distant planet. By Newton's law of universal gravitation, the force F will

A increase as r reduces

B increase as G varies

C remains constant

D increases as r increases

**Correct Option:** A

6
If a freely suspended object is pulled to one side and released, it oscillates about the point of suspension because the

A acceleration is directly proportional to the displacement

B motion is directed away from the equilibrium point

C acceleration is directly proportional to the square of the displacement

D velocity is minimum at the equilibrium ponit

**Correct Option:** A

7
An object moves in a circular path of radius 0.5m with a speed of 1ms

^{-1}What is its angular velocity?
A 8 rads

^{-1}
B 4 rads

^{-1}
C 2 rads

^{-1}
D 1 rads

^{-1}**Correct Option:** C

**Solution**

8
An object of mass 20kg slides down an inclined plane at an angle of 30

[g = 10ms

^{o}to the horizontal. The coefficient of static friction is?[g = 10ms

^{-2}]
A 0.2

B 0.3

C 0.5

D 0.6

**Correct Option:** D

**Solution**

9
A block and tackle is used to raise a load of 250N through a vertical distance of 30m. What is the efficiency of the system if the work done against friction is 1500J?

A 62.5%

B 73.3%

C 83.3%

D 94.3%

**Correct Option:** C

**Solution**

Y = \(\frac{250 \times 30}{250 \times 30 + 1500} \times \frac{150}{1}\)

10
If a load of 1 kg stretches a cord by 1.2cm, what is the force constant of the cord? {g=10ms

^{-2}}
A 866Nm

^{-1}
B 833Nm

^{-1}
C 769Nm

^{-1}
D 667Nm

^{-1}**Correct Option:** B

**Solution**

K = \(\frac{1 \times 10}{\frac{0.2}{100}}\)

K = \(\frac{10}{12} \times \frac{1000}{1}\)

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