set 5 MCQ Questions & Answers Detailed Explanation

Question : 1

Television signals cannot be received beyond a certain distance because

a) Air absorbs signals

b) Antenna is weak

c) Signals are weak

d) The surface of the Earth is curved

Question : 2

Which of the following lens is used to minimize Myopia?

a) Cylindrical lens

b) Concave lens

c) Convex lens

d) None of the above

Question : 3

Fruit stored in a cold chamber exhibit longer storage life because

a) Concentration of carbon dioxide in environment is increases

b) Rate of respiration is decreased

c) Exposure to Sunlight is prevented

d) There is increase in humidity

Question : 4

An assertion and its reason is given below.
Assertion (A):
Salt is used for cooking the food at places on higher from sea level.
Reason (R):
Temperature is low in higher places.
Which one among these is right answer?

a) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

b) (A) is true, but (R) is false

c) Both (A) and (R) are true and (R) is the correct explanation of (A)

d) (A) is false, but (R) is true

Question : 5

Cloudy nights are warmer compared to clear cloudless nights, because clouds:

a) reflect back the heat given off by earth

b) prevent clod waves from the sky from descending on earth

c) produce heat and radiate it towards earth

d) absorb heat from the atmosphere and send it towards earth

Question : 6

Assertion (A):
A piece of ice added to the drink, cools it.
Reason (R):
Ice takes latent heat from the drink for melting resulting in the cooling of the drink.
Select the correct answer using the codes given below.

a) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

b) (A) is true, but (R) is false

c) Both (A) and (R) are true and (R) is the correct explanation of (A)

d) (A) is false, but (R) is true