Q. 41 Which of the following is used in pencils?

A) Phosphorous

B) Silicon

C) Charcoal

D) Graphite

✔ Graphite
View Explanation

Q. 42 What color does yellow and green make?

A) Ocean mist

B) Lime

C) Tangerine

D) Maroon

✔ Lime
View Explanation

Q. 43 Nuclear sizes are expressed in a unit named

A) Angstrom

B) Fermi

C) Tesla

D) Newton

✔ Fermi
View Explanation

Q. 44 As you go down into a well, your weight

A) decreases slightly

B) increases slightly

C) None of the above

D) remains exactly the same

✔ decreases slightly
View Explanation

Q. 45 Which one of the following types of waves are used in a night vision apparatus?

A) Microwaves

B) Radio waves

C) None of the above

D) Infra-red waves

✔ Infra-red waves
View Explanation

Q. 46 The blue colour of the clear sky is due to

A) Dispersion of light

B) Diffraction of light

C) Refraction of light

D) Reflection of light

✔ Dispersion of light
View Explanation

Q. 47 The working principle of a washing machine is

A) diffusion

B) reverse osmosis

C) dialysis

D) centrifugation

✔ centrifugation
View Explanation

Q. 48 Fathometer is used to measure

A) Rainfall

B) Earthquakes

C) Sound intensity

D) Ocean depth

✔ Ocean depth
View Explanation

Q. 49 The colour of rainbow divides into seven colours due to

A) Reflection

B) Diffraction

C) Refraction

D) Dispersion

✔ Dispersion
View Explanation

Q. 50 A person is standing on a weighting machine in a moving lift. The weighing machine will show the least reading, when–

A) going up with a uniform speed

B) coming down with a uniform velocity

C) going up with a uniform velocity

D) Freely falling lift

✔ Freely falling lift
View Explanation

Q. 51 Fuse wire is made of

A) 63% Lead and 37% Tin

B) 63% Tin and 37% Lead

C) 63% Tin and 37% Aluminium

D) 63% Lead and 37% Aluminium

✔ 63% Tin and 37% Lead
View Explanation

Q. 52 What is the use of barometer?

A) To measure air pressure

B) To measure the height of aeroplane

C) To measure the depth of ocean

D) To determine the relative density

✔ To measure air pressure
View Explanation
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