Home
Class 12
PHYSICS
When does an elastic metal rod change it...

When does an elastic metal rod change its length?

A

falls vertically under its weight

B

is pulled along its length by a force acting at one end

C

rotates about an axis at one end

D

slides on a rough surface

Text Solution

Verified by Experts

The correct Answer is:
B, C
Promotional Banner

Topper's Solved these Questions

  • ELASTICITY AND WAVES

    FIITJEE|Exercise Assignment Problems (Objective) Level-I|40 Videos

  • CURRENT ELECTRICITY

    FIITJEE|Exercise Comprehension -4|3 Videos

  • ELECTROMAGNETIC INDUCTION

    FIITJEE|Exercise EXERCISE|9 Videos

Similar Questions

Explore conceptually related problems

Identify the case when an elastic metal rod does not undergo elongation

The fundamental radio antenna is a metal rod which has a length equal to

Which of the modulus of elasticity is involved in compressing a rod to decreases its length ?

on heating a cylindrical metallic rod, its length increases by 2% . Then area of cross section of rod will

A rod of length 20 cm made of metal A expands by 0.075 when its temperature is raised from 0^(@) C to 100^(@)C . Another rod of a different metal B having the same length expands by 0.045 cm for the same change in temperature. A third rod of the same length is composed of two parts, one of metal A and other of metal B. This rod expands by 0.065 cm for the same change in temperature. The portion made of metal A has the length :

How will the the time period of a simple pendulum change when its length is doubled ?

A compressive force, F is applied at the two ends of a long thin steel rod. It is heated, simultaneously, such that its temeprature increass by DeltaT . The net change in its length is zero. Let l be the length of the rod, A its area of cross-section, Y its Young's modulus, and alpha its coefficient of linear expansion. Then, F is equal to

A rod of length 20 cm is made of metal. It expands by 0.075 cm when its temperature is raised from 0^(@)C to 100^(@)C . Another rod of different metal B having the same length expands by 0.045 cm for the same change in temperature. A third rod of the same length is composed of two parts, one of metal A and the oher of metal B . This rod expandss by 0.060 cm for the same change in temperature. The portion made of metal A has the length :

(a) How does the resistance of a pure metal change if its temperature decreases? (b) How does the presence of impurities in a metal affect its resistance?

Knowledge Check

  • An elastic metal rod will change its length when it

    A
    falls vertically under its weight
    B
    is pulled along its length by a force acting at one end
    C
    rotates about an axis at one end
    D
    slides on a rough surface

  • Identify the case when an elastic metal rod does not undergo elongation

    A
    it is pulled with a constant acceleration on a smooth horizontal surface
    B
    it is pulled with constant acceleration on a smooth horizontal surface
    C
    it is allowed to fall freely
    D
    All of the above

  • The fundamental radio antenna is a metal rod which has a length equal to

    A
    `lamdba` in free space at the frequency of operation
    B
    `omega//2` in free space at the frequency of operation
    C
    `lambda//4` in free space at the frequency of operation
    D
    `3 lambda//4` in free space at the frequency of operation