General Science MCQs with Answers For UPSC, SSC, WBPSC Exams P11

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Page 11

1481101. The hydraulic breaks used in automobiles is a direct application of -

A

Pascal's law

B

Archimedes

C

Bernoulli's theorem

D

Torricelli law.

A

Correct Answer: A. Pascal's law
Explanation: Pascal's principle, also called Pascal's law, in fluid (gas or liquid) mechanics, statement that in a fluid at rest in a closed container, a pressure change in one part is transmitted without loss to every portion of the fluid and to the walls of the container.

1490102. In case of an ideal gas, Joule-Thomson effect is

A

negative

B

infinite

C

zero

D

positive.

C

Correct Answer: C. zero

1484103. The same force is applied to two bodies A and B of masses m and 5m respectively for the same time. Then

A

The momentum of A will be greater.

B

The momentum of B will be greater.

C

The velocity of A and B will be the same.

D

The momentum of A and B will be the same.

D

Correct Answer: D. The momentum of A and B will be the same.

1489104. A glass bulb is balanced by a brass weight on a sensitive beam balance. Now the balance is covered by a bell-jar which is then evacuated

A

The pan containing the bulb will go up or down depending on the degree of vacuum produced

B

The pan containing the bulb will go down

C

The beam will continue to remain horizontal

D

The pan containing the bulb will go up.

B

Correct Answer: B. The pan containing the bulb will go down

1526105. Which of the following metals is the best conductor of heat and electricity

A

Silver

B

Potassium

C

Sodium

D

Copper

A

Correct Answer: A. Silver

1534106. If the temperature is kept constant during a reaction, the process is called

A

Isochoric

B

Isothermal

C

Adiabatic

D

Isobaric

B

Correct Answer: B. Isothermal

1516107. When the angle of incidence is equal to the critical angle for the media, the angle of refraction is

A

45°

B

90°

C

0°

D

Angle of incidence

B

Correct Answer: B. 90°

1460108. A piece of cotton cloth gets wet if one end of it is dipped in water in a glass. This is due to

A

Elasticity

B

Capillarity

C

Gravitation

D

Viscosity.

B

Correct Answer: B. Capillarity

1609109. Which of the following waves is used for telecommunication?

A

Microwaves

B

X-rays

C

Infrared rays

D

Ultraviolet rays

A

Correct Answer: A. Microwaves

1582110. RADAR is based on the principle that

A

Sound waves are reflected by an object

B

Sound waves are a transverse wave

C

Radio waves are reflected by objects

D

Sound waves can travel in the air

C

Correct Answer: C. Radio waves are reflected by objects

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