Physics Test 140

Result

Physics Test 140

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Weekly Quiz Competition

Question 1
4 / -1

The unit of impulse is the same as that of

A
energy

B
power

C
momentum

D
velocity

Solution

Impulse = change in momentum
Question 2
4 / -1

The water drops fall at regular intervals from a tap 5 m above the ground. The third drop is leaving the tap at an instant when the first drop touches the ground. How far above the ground is the second drop at that instant?

A
1.25 m

B
2.50 m

C
3.75 m

D
5.00 m

Solution
Question 3
4 / -1

A
120^o

B
150^o

C
135^o

D
180^o

Solution
Question 4
4 / -1

A body of mass M is kept on a rough horizontal surface A person is trying to pull the body by applying a horizontal force but the body is not moving. The force by the surface on the body is F, then

A

B

C

D

Solution
Question 5
4 / -1

A block C of mass m is moving with velocity v₀ and collides elastically with block A of mass m and connected to another block B of mass 2m through spring constant k. What is k if x₀ is compression of spring when velocity of A and B is same?

A

B

C

D

Solution
Question 6
4 / -1

A uniform rod of length l is free to rotate in a vertical plane about a fixed horizontal axis through O. The rod begins rotating from rest from its unstable equilibrium position. When it has turned through an angle q, its angular velocity ω is given as

A

B

C

D

Solution
Question 7
4 / -1

Consider Earth to be a homogeneous sphere. Scientist A goes deep down in a mine and scientist B goes high up in a balloon. The gravitational field measured by

A
A goes on decreasing and that by B goes on increasing

B
B goes on decreasing and that by A goes on increasing

C
each decrease at the same rate

D
each decrease at different rates

Solution

Both decreases but variation are different.
Question 8
4 / -1

Copper of fixed volume ‘V; is drawn into wire of length ‘l’. When this wire is subjected to a constant force ‘F’, the extension produced in the wire is Which of the following graphs is a straight line?

A

B

C

D

Solution
Question 9
4 / -1

If the terminal speed of a sphere of gold (density = 19.5 kg/m³) is 0.2 m/s in a viscous liquid (density = 1.5 kg/m³), find the terminal speed of a sphere of silver (density = 10.5 kg/m³) of the same size in the same liquid

A
0.4 m/s

B
0.133 m/s

C
0.1 m/s

D
0.2 m/s

Solution
Question 10
4 / -1

A block of steel heated to 100^oC is left in a room to cool. Which of the curves shown in fig., represents the correct behaviour?

A
A

B
B

C
C

D
None of these

Solution

According to Newton’s law of cooling if temperature difference between body & surrounding is large, then rate of cooling is also fast hence curve A shows correct behaviour.