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Physics Questions Answers

Q51 :

Which one of the following raw materials is used in the manufacture of foam used in mattresses, cushions, etc.?

A
  

Methanol

B
  

Ethanol

C
  

Urea

D
  

Phenol

View Answer
Correct Answer: B

Ethanol

No Description Available
Q52 :

Permanent magnets can be made from —

A
  

cobalt

B
  

aluminium

C
  

zinc

D
  

lead

View Answer
Correct Answer: A

cobalt

No Description Available
Q53 :

Carnot cycle is associated with

A
  

Hydrodynamics

B
  

Aerodynamics

C
  

Thermodynamics

D
  

Biological rhythm

View Answer
Correct Answer: C

Thermodynamics

No Description Available
Q54 :

The developer used for developing a photographic film is, chemically

A
  

a reducing agent

B
  

an oxidising agent

C
  

a neutralising agent

D
  

a complexing agent

View Answer
Correct Answer: A

a reducing agent

No Description Available
Q55 :

Sound travels faster in

A
  

dry air than in water

B
  

wood than in iron

C
  

iron than in air

D
  

hydrogen than in water

View Answer
Correct Answer: C

iron than in air

No Description Available
Q56 :

According to Einstein's theory of relativity, when a body moves with a velocity comparable to the velocity of light, its 

A
  

mass and length decrease

B
  

mass and length increase

C
  

length increases but mass decreases

D
  

length decreases but mass increases

View Answer
Correct Answer: C

length increases but mass decreases

No Description Available
Q57 :

The boiling point of water is much higher than other liquids of similar size and molecular weight because

A
  

it is polar covalent compound

B
  

it is an electrovalent compound

C
  

it is a liquid at ordinary temperatures

D
  

it shows inter-molecular hydrogen bonding

View Answer
Correct Answer: A

it is polar covalent compound

No Description Available
Q58 :

Materials used for making cooking utensils should have

A
  

low specific heat and high thermal conductivity

B
  

high specific heat and high thermal conductivity

C
  

low specific heat and low thermal conductivity

D
  

high specific heat and low thermal conductivity

View Answer
Correct Answer: A

low specific heat and high thermal conductivity

No Description Available
Q59 :

Electric current passing through a metallic wire generates heat because of

A
  

collisions of conduction electrons with each other

B
  

collisions of the atoms of the metal with each other

C
  

the energy released in the ionisation of the atoms of the metal

D
  

collisions of the conduction electrons with the atoms of the metallic wire

View Answer
Correct Answer: D

collisions of the conduction electrons with the atoms of the metallic wire

No Description Available
Q60 :

Concave mirrors are used as shaving mirrors because they

A
  

do not distort images

B
  

always produce real images

C
  

produce magnified images

D
  

never produce inverted images

View Answer
Correct Answer: C

produce magnified images

No Description Available
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