10th Class Physics MCQS Chapter 4

According to Coulomb’s law , what happens to the attraction of two oppositely charged objects as their distance of separation increases?

Increase

Decreased

can not be determined

remain unchanged

Old people cannot hear sound above than:

20000 Hz

15000 Hz

1000 Hz

In case of OR and AND operation, if switches s₁ and s₂ both are open then lamp is:

Off

Neither on nor off

Sometimes on and sometimes off

On

Which is used to investigate the properties of electron beam

LDR

Proton gun

Electroscope

Electron gun

1 bel=

10 dB

0.1 dB

0.01 dB

100 dB

A positive and negative charges are initially 4 cm apart. When they are moved closer together so that they are now only 1 cm apart, the force between them is:

4 times larger than before

16 times larger than before.

8 times larger than before

4 times smaller than before

Sound waves having frequency higher than 20,000 Hz are called:

Infrasonic

Audible

Echo

Ultrasonic

When you rub a plastic rod against your hair several times and put it near some bits of paper, the pieces of papers are attracted towards it. What does this observation indicate?

the rod acquires a negative charge

the rod and the paper are oppositely charged

the reod and the paper have the same charges

the rod acquires a positive charge

Frequency of tuning fork depends upon its _____. of prongs:

Weight

Speed

Mass

Distance

1 nano farad is equal to:

1 x 10 ⁶F

1 x 10⁹F

1 x 10^-9F

1 x 10 ¹² F