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

General Science

jkssb physics set 1 mcqs

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Practice Questions

448 Total
Question 391 Discuss
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A fuse is always connected in which part of the electrical circuit?

A
neutral wire
B
live wire
C
earth wire
D
anywhere in the circuit

Answer & Explanation

Correct Option: B

Connecting the fuse to the live wire ensures that the appliance is disconnected from the high-voltage source if the fuse blows.
Question 392 Discuss
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When a ship enters the sea from a river, it:

A
sinks a little
B
remains at the same level
C
rises a little
D
depends on the weight of the ship

Answer & Explanation

Correct Option: C

Sea water is denser than river water due to dissolved salts; thus, it provides more buoyant force, making the ship float higher.
Question 393 Discuss
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The device used to measure the depth of the ocean is:

A
fluxmeter
B
fathometer
C
endoscope
D
hydrometer

Answer & Explanation

Correct Option: B

A fathometer uses sonar (sound navigation and ranging) technology to calculate the depth of water.
Question 394 Discuss
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In a p-n junction diode, the depletion layer is formed by:

A
diffusion of charge carriers
B
drift of charge carriers
C
application of forward bias
D
application of reverse bias

Answer & Explanation

Correct Option: A

Holes and electrons diffuse across the junction and recombine, leaving behind a region devoid of mobile charge carriers.
Question 395 Discuss
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Newton's First Law of motion defines which physical concept?

A
force
B
inertia
C
momentum
D
acceleration

Answer & Explanation

Correct Option: B

The first law states that an object resists changes to its state of motion, which is the definition of inertia.
Question 396 Discuss
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For a normal human eye, the least distance of distinct vision is:

A
25 m
B
2.5 cm
C
25 cm
D
infinite

Answer & Explanation

Correct Option: C

This is the minimum distance at which the eye can see objects clearly without any strain.
Question 397 Discuss
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Which of the following is the most elastic substance?

A
rubber
B
steel
C
glass
D
plastic

Answer & Explanation

Correct Option: B

In physics, elasticity is the ability to resist deformation. Steel has a much higher Young's modulus than rubber.
Question 398 Discuss
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The weight of an object at the center of the Earth is:

A
infinite
B
same as on the surface
C
zero
D
half of that on the surface

Answer & Explanation

Correct Option: C

At the Earth's center, the gravitational pull from all directions cancels out, making the net acceleration due to gravity zero.
Question 399 Discuss
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Which radioactive isotope is used to determine the age of fossils?

A
uranium-238
B
cobalt-60
C
carbon-14
D
iodine-131

Answer & Explanation

Correct Option: C

Carbon-14 dating is used for organic remains by measuring the decay of the radioactive carbon isotope.
Question 400 Discuss
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When milk is churned, the cream separates from it due to:

A
centripetal force
B
centrifugal force
C
frictional force
D
gravitational force

Answer & Explanation

Correct Option: B

The lighter cream particles experience a centrifugal force that moves them away from the center of rotation.
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