Question of Exercise 2

# Question Two bodies having the same mass 2kg each have different surface areas 50m2 and 100m2 in contact with a horizontal plane. If the coefficient of friction is 0.2, the forces of friction that come into play when they are in motion will be in the ratio.

Option 1 1 : 1

Option 2 1 : 2

Option 3 2 : 1

Option 4 1 : 4

#### Frequently Asked Questions

1 pascal is equal to ..Nm^-2

Solution:

Explanation:

Pascal is the unit of pressure. Pressure is the force applies on unit area. Therefore,

1 pascal =1 Nm-2

Hence,1 pascal is equal to 1 Nm-2.

Which object is vibrating when the following sounds

are produced?a) the sound of a sitar b) the sound of a table c) the sound of a tuning fork d) the buzzing of a bee or mosquito e) the sound of a flute?

Solution:

Explanation:

When a vibrating tuning fork is placed on a table, then a large sound is heard because  the entire system begins vibrating and forces surrounding air particles into vibration motion.

The tendency of one object to force another adjoining or interconnected object into vibration motion is referred to as a forced vibration.

Therefore, option B is correct.

Differentiate between luminous and non uminous objects

Solution:

Explanation:

The differences between luminous and non-luminous objects are,

 Luminous Objects Non-luminous Objects Luminous objects are objects that can emit light energy on theirown. Non-luminous things are those that cannot emit light energyon their own. These things can produce a light sense. These things do not produce a bright sense. Because they emit light on their own, the bright objects are visible. Because of the bright things, non-luminous objects are seen. Two examples are the sun and the candle. Two examples are the moon and planets.

Hence, the differences between luminous and non-luminous objects are tabulated above.

Lightning occurs because of

A: rain

B: electric discharge

C: wind

D: shaking of earth

Solution:

Explanation:

Lightning is a natural discharge of the static built up in the clouds during a storm.

This effect occurs due to the separation of the positive and negative ions during a storm.

Hence, option B is correct.

Silicon Valley of India is located in

B: Bangaluru

D: Srinagar

Solution:

Explanation:

• The location of Bengaluru on the Deccan Plateau gets its name as ‘Silicon Plateau’.
• It is also called as IT hub of India or Silicon Valley of India.
• The location of the IT industries is the major factors in case of the Bengaluru as it has

temperate climate with temperature rarely dropping below 00 centigrade.