set 7 MCQ Questions & Answers Detailed Explanation

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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq

Questions : Consider the following statements :
  1. Convex lens is used ina  terrestrial telescope.
  2. Convex lens of a small focal length is used as a magnifying glass.
  3. Convex lens forms an enlarged image of an object, when the object is placed beyond the focus of the lens.
Which of these statements are correct?

(a) 1 and 3

(b) 1 and 2

(c) 2 and 3

(d) 1, 2 and 3

The correct answers to the above question in:

Answer: (b)

The enlarged image is formed by a convex lens when the object is placed between F1 and 2F1. Behind 2F1 the size of the image continuous decreases.

At 2F1, the size of the image formed by the convex lens is as same as the object.

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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers

Question : 1

Reading glasses are made from which type of lenses?

a) Plain

b) Convex

c) Concave

d) None of these

Answer: (b)

Question : 2

Match List I with List II and select the correct answer using the codes given below the lists.

List I List II
A. Sound wave 1. Transverse
B. Lightwave 2. Longitudinal
C. The speed of sound in a perfectly rigid rod 3. zero
D. The speed of sound in a vacuum 4. Infinite
Choose the correct option from the codes given below :

a) A – 4, B – 1, C – 2, D – 3

b) A – 2, B – 1, C – 4, D – 3

c) A – 2, B – 3, C – 4, D – 1

d) A – 4, B – 3, C – 2, D – 1

Answer: (b)

Sound waves cannot travel in a vacuum, because sound waves are mechanical waves.

Question : 3

The concept of expanding universe is based on

a) Zeeman effect

b) Stark effect

c) Doppler effect

d) Raman effect

Answer: (c)

Question : 4

Which one of the following types of waves are used in a night vision apparatus?

a) Microwaves

b) Radio waves

c) Infra-red waves

d) None of the above

Answer: (c)

Question : 5

Assertion (A):
In a pressure cooker food is cooked above boiling point.
Reason (R):
Boiling point of water increases as the pressure increases.

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

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

c) A is true, but R is false

d) A is false, but R is true

Answer: (b)

Question : 6

When the same note is played on a sitar and a flute, the sound produced can be distinguished from each other because of the difference in

a) pitch and loudness

b) quality only

c) pitch, loudness and quality

d) loudness only

Answer: (b)

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