MEDIUM
Earn 100

Consider the following statements about the microphone and the speaker of a mobile phone :

1. The microphone converts sound to a mechanical signal.

2. The microphone converts sound to an electrical signal.

3. The speaker converts a mechanical signal to sound.

4. The speaker converts an electrical signal to sound.

Which of the statements given above is correct?

50% studentsanswered this correctly

Important Questions on Energy

EASY
Life Science>Change and System>Energy>Energy Transfer

Which among the following is the correct statement?
A. When an object is thrown upwards, then in any case whether going upwards or coming downwards its speed will remain the same. 
B. The weight of any object cannot be zero. 
 

EASY
Life Science>Change and System>Energy>Energy Transfer
If the velocity of a body is doubled its momentum _____.
EASY
Life Science>Change and System>Energy>Energy Transfer
A force may change ___ of an object. 
MEDIUM
Life Science>Change and System>Energy>Energy Transfer
If two forces 10N and 5N are applied on an object in the same direction, then what will be the total force applied on the object? 
MEDIUM
Life Science>Change and System>Energy>Energy Transfer
What is the rate of doing work?
EASY
Life Science>Change and System>Energy>Energy Transfer
Odometer is used to measure _______:
EASY
Life Science>Change and System>Energy>Energy Transfer
A body of mass 8 kg is moving with a velocity of 4 m/s, find the momentum.
EASY
Life Science>Change and System>Energy>Energy Transfer
When a car starts suddenly from rest, the people are sitting inside the car more backward. This event is an example of:
MEDIUM
Life Science>Change and System>Energy>Energy Transfer
After the explosion of a shell, many pieces fly off in different directions. In such a case, what is conserved? 
EASY
Life Science>Change and System>Energy>Energy Transfer
Which of the following is the kinetic energy? 
a. bullet from the gun.
b. a railway engine at a fast speed.
c. the motion of an ordinary pendulum. 
 
MEDIUM
Life Science>Change and System>Energy>Energy Transfer
How much force will be used to displace an object of 60kg to a distance of 4m? 
MEDIUM
Life Science>Change and System>Energy>Energy Transfer
The angle between displacement and force applied when no work is done is:
MEDIUM
Life Science>Change and System>Energy>Energy Transfer
_____ is caused due to irregularities between two surfaces.
EASY
Life Science>Change and System>Energy>Energy Transfer
For an object, potential energy at a height is known as _____.
MEDIUM
Life Science>Change and System>Energy>Energy Transfer
______ is caused due to irregularities between two surfaces:
MEDIUM
Life Science>Change and System>Energy>Energy Transfer
If a girl weighing 40N climbs up a rope with the force of 160W for 20seconds, then what height will she climb? 
MEDIUM
Life Science>Change and System>Energy>Energy Transfer
As long as an unbalanced force is applied to a body, its continues to change continuously:

 

EASY
Life Science>Change and System>Energy>Energy Transfer

What is the energy possessed by a body due to its motion is called?

EASY
Life Science>Change and System>Energy>Energy Transfer
A body rolling down on a hill has _____:
EASY
Life Science>Change and System>Energy>Energy Transfer

A particle in the medium completes 40 vibrations in 2.5 s. The frequency of the wave is ____: