Elasticity Test

Result

Elasticity Test - 4

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

A steel wire is fixed at its one end on the roof. At other ends of the wire, 1 kg mass is hanged so that the energy stored in the wire is E. The energy stored in the same wire if we hang 2 kg mass instead of 1 kg is:

A
2E

B
4E

C
8E

D
E

Solution
Question 2
1 / -0

Three identical balls of rubber, aluminium, and steel are dropped from the same height on a horizontal rigid surface. If V_rubberV_Al, and V_steelare their speeds just after the collision, then

A
V_rubber = V_Al = V_steel

B
V_rubber > V_Al > V_steel

C
V_rubber < V_Al < V_steelV

D
V_rubber > V_Al = V_steel

Solution

As we know, E_s>E_Al>E_rubber

Therefore, V_rubber<V_Al<V_steel
Question 3
1 / -0

The breaking strength of the iron wire of radius r and length l is 2 x 10⁶ N/m². Breaking strength of another iron wire of radius r, and length l at the same temperature will be:

A
0.5 x 10⁶ N/m²

B
1 x 10⁶ N/m²

C
2 x 10⁶ N/m²

D
8 x 10⁶ N/m²

Solution

At the same temperature, the breaking strength of another iron wire of radius r, and length l will be the same i.e. 2×10⁶ N/m².
Question 4
1 / -0

Which of the following has the greatest elasticity?

A
Rubber

B
Steel

C
Wood

D
Mud

Solution

Steel has the maximum elasticity among the given substances.
Question 5
1 / -0

Compressed rubber ball has:

A
decreased potential energy.

B
increased potential energy.

C
decreased kinetic energy.

D
increased kinetic energy.

Solution

When we compress the ball then its potential energy gets increased.
Question 6
1 / -0

The diagrams represent the potential energy U as a function of interatomic separation r. Which of the following diagrams corresponds to stable molecules found in nature?

A

B

C

D

Solution

The potential energy function u(r) of inter-atomic distance r is given by,
Question 7
1 / -0

In the following questions, a statement of assertion (A) is followed by a statement of the reason (R).

A: Steel is more elastic than rubber.

R: Deformation in steel is less than rubber for equal forces.

A
If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).

B
If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).

C
If Assertion is a true statement but Reason is false, then mark (3).

D
If both Assertion and Reason are false statements, then mark (4).

Solution

Steel is more elastic than rubber. So, the Assertion is correct.

It is also correct that deformation in steel is less than the rubber for equal forces. So, the reason is the correct explanation of the assertion.
Question 8
1 / -0

In the following questions, a statement of assertion (A) is followed by a statement of the reason (R)

A: Air is more elastic than iron.

R: Elasticity is directly proportional to Bulk modulus and the Bulk modulus of air is more than that of steel

A
If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).

B
If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).

C
If Assertion is a true statement but Reason is false, then mark (3).

D
If both Assertion and Reason are false statements, then mark (4).

Solution

The Assertion is wrong because iron is more elastic than air.

And the reason is also incorrect.
Question 9
1 / -0

In the following questions, a statement of assertion (A) is followed by a statement of the reason (R)

A: Almost for all metals, the modulus of elasticity decreases with a rise in temperature.

R: By increasing temperature, the intermolecular force decreases.

A
If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).

B
If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).

C
If Assertion is a true statement but Reason is false, then mark (3).

D
If both Assertion and Reason are false statements, then mark (4).

Solution

The assertion is true because elasticity is inversely proportional to the temperature and the reason is also correct and the reason is the correct explanation of the assertion.
Question 10
1 / -0

A wire of length L, area of cross section A is hanging from a fixed support. The length of the wire changes to L₁ when mass M is suspended from its free end. The expression for Young's modulus is:

A

B

C

D

Solution