Physics Test 165

Result

Physics Test 165

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Weekly Quiz Competition

Question 1
4 / -1

A and B have different dimensions. Then which of the following relation will be meaningful?

A

B

C

D

Solution

A and B have different dimensions. Hence, only A and

B in a ratio form and is meaningful.
Question 2
4 / -1

A

B

C

D

Solution
Question 3
4 / -1

A

B

C

D

Solution
Question 4
4 / -1

A player stops a football weighing 0.5 kg which comes flying towards him with a velocity of 10m/s. If the impact lasts for 1/50th sec. and the ball bounces back with a velocity of 15 m/s, then the average force involved is

A
250 N

B
1250 N

C
500 N

D
625 N

Solution
Question 5
4 / -1

A spring of spring constant is stretched initially by 5 cm from the unstretched position. Then the work required to stretch it further by another 5 cm is

A
12.50 Nm

B
18.75 Nm

C
25.00 Nm

D
6.25 Nm

Solution
Question 6
4 / -1

A hollow sphere is held suspended. Sand is now poured into it in stages. The centre of mass of the sphere with the sand

A
rises continuously

B
remains unchanged in the process

C
first rises and then falls to the original position

D
first falls and then rises to the original position

Solution

Initially centre of mass is at the centre. When sand is poured it will fall and again after a limit, centre of mass will rise.
Question 7
4 / -1

Two wires A and B are of the same material. Their lengths are in the ratio 1 : 2 and the diameter are in the ratio 2 : 1. If they are pulled by the same force, then increase in length will be in the ratio

A
2 : 1

B
1 : 4

C
1 : 8

D
8 : 1

Solution
Question 8
4 / -1

The diagram below shows three soap bubbles A, B and C prepared by blowing the capillary tube fitted with stop cocks S, S₁, S₂ and S₃ . When all the three stop cocks S₁, S₂ and S₃ are opened and S closed, then

A
B will start collapsing with the increasing volume of A and C

B
C will start collapsing with the increasing volume of A and B

C
Volumes of A, B and C will become equal at equilibrium

D
C and A will both start collapsing with the increasing volume of B

Solution

The excess pressure inside a bubble of soap is given by It means excess pressure inside the bubbles A and C is more than inside B. So, air will go towards B from A and C. So, A and C will start collapsing with the increasing volume of B.
Question 9
4 / -1

A

B

C

D

Solution
Question 10
4 / -1

Air is pumped into an automobile tube upto a pressure of 200 kPa in the morning when the air temperature is 22°C. During the day, temperature rises to 42°C and the tube expands by 2%. The pressure of the air in the tube at this temperature, will be approximately

A
212 kPa

B
209 kPa

C
206 kPa

D
200 kPa

Solution