General Science Jkssb Physics Set 1 Mcqs (448 MCQs) | JKSSB & SSC Quiz

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jkssb physics set 1 mcqs

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Practice Questions

448 Total
Question 441 Discuss
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A solar cell works on the principle of:

A
photovoltaic effect
B
photoelectric effect
C
thermionic emission
D
compton effect

Answer & Explanation

Correct Option: A

The photovoltaic effect is the generation of voltage and electric current in a material upon exposure to light.
Question 442 Discuss
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The force that keeps the planets in orbit around the Sun is:

A
magnetic force
B
electrostatic force
C
gravitational force
D
nuclear force

Answer & Explanation

Correct Option: C

Gravity provides the centripetal force necessary for planets to maintain their elliptical orbits around the Sun.
Question 443 Discuss
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What is the reason for the reddish appearance of the Sun during sunrise and sunset?

A
refraction of light
B
diffraction of light
C
scattering of light
D
total internal reflection

Answer & Explanation

Correct Option: C

At the horizon, light travels through more atmosphere; blue light is scattered away, leaving the longer wavelength red light.
Question 444 Discuss
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The magnifying power of an astronomical telescope can be increased by:

A
increasing the focal length of the eyepiece
B
decreasing the focal length of the eyepiece
C
increasing the focal length of the objective
D
both b and c

Answer & Explanation

Correct Option: D

Magnification $M = f_o / f_e$. Thus, increasing the objective focal length or decreasing the eyepiece focal length increases magnification.
Question 445 Discuss
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Which of the following has the highest latent heat of vaporization?

A
alcohol
B
water
C
ether
D
chloroform

Answer & Explanation

Correct Option: B

Water has very strong hydrogen bonding, requiring significant energy to break molecules apart into steam.
Question 446 Discuss
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The force of friction always acts in a direction:

A
parallel to the applied force
B
perpendicular to the surface
C
opposite to the direction of motion
D
along the direction of motion

Answer & Explanation

Correct Option: C

Friction is a resistive force that opposes relative motion or the tendency of motion between two surfaces.
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The time period of a seconds pendulum is:

A
1 second
B
2 seconds
C
0.5 second
D
4 seconds

Answer & Explanation

Correct Option: B

A seconds pendulum takes 1 second to swing each way, making its total oscillation period 2 seconds.
Question 448 Discuss
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The handle of a pressure cooker is made of Bakelite because it is:

A
a good conductor of heat
B
a bad conductor of heat
C
very light
D
unbreakable

Answer & Explanation

Correct Option: B

Bakelite is a thermosetting plastic that acts as an insulator, preventing the handle from getting hot.
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