10th Class Physics MCQS Chapter 4

The SI the unit of charge is:

Watt

Volt

Coulomb

Joule

Two uncharged objects A and B are rubbed against each other. When object B is placed near a negatively charged object C, the two objects repel each other. Which of these statements is true about object A.

Becomes negatively charged

Becomes positively charged

Unpredicatable

Remains uncharged

The electrostatic force acting on two charges each of 1 C separated by 1m is about .

9 x 10 ⁹N

9 x 10⁸N

9 x 10 ⁸N

9 x 10⁹ N

The intensity of lawn mover is:

10-2 wm^-2

10 1 wm ²

10 3 wm ²

10 4 wm ²

Five joules of work is needed to shift 10 C of charge from one place to another. The potential difference between the places is:

10 V

2 V

0.5 V

5 V

An object gains excess negative charge after being rubbed against another object, which is:

Either, a,b,and c

Neutral

Negatively charged

Charged

The speed of sound in are water at 25°C is:

1560 ms^-1

1530 ms^-1

1570 ms^-1

1531ms-1

Electric field lines of force were first introduced by:

Fleming

Farady

Ampere

Coulomb

The speed of sound in iron at 25°C is:

6940 m/sec

5900 m/sec

6950 m/sec

5950 m/sec

The frequency of silent whistle is:

2000 Hz – 2500Hz

25000 KHz

200 KHz – 2000 Hz

20,000 Hz – 25000Hz