Question of Exercise 2

Light of Class 8

Question
In case of concave mirror, the minimum distance between a real object and its real image is :

Answer

Option 1 f

Option 2 2f  

Option 3 4f

Option 4 zero

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

Final Answer:

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.

Final Answer: 

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.

Final answer:

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.

Final Answer:

Hence, option B is correct.

 

Silicon Valley of India is located in

A: Dehradun

B: Bangaluru

C: Hyderabad

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.

Final Answer:

Hence the correct answer is option B. Bengaluru.

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