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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
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
The correct answers to the above question in:
Answer: (b)
Discuss Form
Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
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 »Answer: (c)
Question : 2
Consider the following statements :
- Convex lens is used ina terrestrial telescope.
- Convex lens of a small focal length is used as a magnifying glass.
- Convex lens forms an enlarged image of an object, when the object is placed beyond the focus of the lens.
a) 1 and 3
b) 1 and 2
c) 2 and 3
d) 1, 2 and 3
Answer »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.
Question : 3
Reading glasses are made from which type of lenses?
a) Plain
b) Convex
c) Concave
d) None of these
Answer »Answer: (b)
Question : 4
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 »Answer: (b)
Question : 5
Mr X was advised by an architect to make outer walls of his house with hollow bricks. The correct reason is that such walls
a) help keeping inside cooler in summer and warmer in winter
b) make the building stronger
c) prevent seepage of moisture from outside
d) protect the building from lightning
Answer »Answer: (a)
Question : 6
Expansion during heating
a) decreases the density of a material
b) occurs only in solids
c) increases the weight of a material
d) occurs at the same rate for all liquids and solids
Answer »Answer: (a)
Solids, liquids and gases all expand on being heated as a result,
Density = (mass/volume) decreases.
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