# 2011 JAMB Physics Past Questions & Answers - page 1

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1
A man standing on a lift that is descending does not feel any weight because

A the inside of the lift is air tight

B the lift is in vacuum

C there is no reaction from the floor of the lift

D there is no gravitational pull on the man in the lift

**Correct Option:** C

**Solution**

Mg - mg = 0

The man feels weightless because the reaction, R is equal to the weight mg

2
Two balls X and Y weighing 5 g and 50 kg respectively were throne up vertically at the same time with a velocity of 100 ms

^{1}.How will their positions be one second later?
A X and Y will be 500 m from each other

B Y will be 500 m ahead of X

C X will be 500 m ahead of Y

D X and Y both be 500 m from the poin of throw

**Correct Option:** D

**Solution**

^{2}= U

^{2}- 2G s

0 = 100

^{2}- 2 x 10 x s = 10000 - 20s

s = (10000)/20 = 500m

Which is independent of mass.the two bodies where acted upon by the same retarding force of gravity which is independent of mass of the body; therefore both will be 500 m from the point of throw.

3
If it takes an object 3s to fall freely to the ground from a certain height, what is the distance covered by the object?

A 90 m

B 30 m

C 45 m

D 60 m

**Correct Option:** C

**Solution**

^{2}

S = (1)/2 x (10)/1 x 3

^{2}=5 x 9 = 45 m

4
An object of mass 2 kg moves with a velocity of 10 ms

^{1}round at circle of radius 4 m. Calculate the centripetal force on the object
A 25 N

B 100 N

C 50 N

D 40 N

**Correct Option:** C

**Solution**

F = \( \frac{mv^2}{r} \)

= \( \frac{2 \times 10^2}{4} \)

= \( \frac{200}{4} \)= 50N

5
A carpenter on top of a roof of 20.0m high dropped a hammer of mass 1.5 kg and it fell directly to the ground. the kinetic energy of the hammer just before hitting the ground is?

[g = 10 ms

[g = 10 ms

^{-2}]
A 600 J

B 150J

C 300 J

D 450 J

**Correct Option:** C

**Solution**

= P e at the maximum height (conservation of mechanical energy)

K e = P e = mgh = 1.5 x 10 x 20

= 300 J

6
If a tube of small radius opened at both ends is placed in a liquid, the liquid will

A remain at the same level irrespective of whether the liquid wet the glass or not

B fall below the liquid level if the liquid wets the glass

C falls below the liquid level if the liquid does not wet the glass

D rise above the liquid level if the liquid does not wet the glass

**Correct Option:** C

**Solution**

7
An object weighs 22 kg in water and 30kg in air. what is the upthrust exerted by the liquid on the object.

[g = 10 ms

[g = 10 ms

^{2}]
A 50 N

B 520 N

C 220 N

D 80 N

**Correct Option:** D

**Solution**

8
A metal of volume 40 cm

^{3}is heated from 30 °c to 90 °c, the increase in volume is
A 0.12 cm

^{3}
B 4.00 cm

^{3}
C 1.20 cm

^{3}
D 0.40 cm

^{3}**Correct Option:** E

**Solution**

##### Correct Answer: Option E
increase in volume, DV = RV_{1} ∆ θ = 3α Vsub>1

9
A copper wire was subjected to a tensile stress of 7.7 x 10

[young modules = 1.1 x 10

^{7}x 10 Nm^{-2}. calculate strain of the wire.[young modules = 1.1 x 10

^{11}Nm^{-2}]
A 2. 0 x 10

^{-5}
B 7.0 x 10

^{-3}
C 7.0 x 10

^{-4}
D 2.2 x 10

^{-4}**Correct Option:** C

**Solution**

= \( 1.1 \times 10^11 = \frac{7.7 \times 10^7}{\text{Tensile Strain}} \)

∴ Tensile strain = \( \frac{7.7 \times 10^7}{1.1 \times 10^11} \)

= \( 7.0 \times 10^{7-11}

= 7.0 \times 10^{-4} \)

10
I. High thermal capacity.

II. High sensitivity.

III.Easy readability.

IV. Accuracy over a wide range of temperature

From the statement above, the qualities of a good thermometer are

II. High sensitivity.

III.Easy readability.

IV. Accuracy over a wide range of temperature

From the statement above, the qualities of a good thermometer are

A I and II

B I, II,III and IV

C I, III and IV

D II, III and IV

**Correct Option:** D

**Solution**

∴ II, III and IV are qualities of a good thermometer

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