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 421 Discuss
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Specific resistance of a wire depends on its:

A
length
B
cross-sectional area
C
material
D
mass

Answer & Explanation

Correct Option: C

Specific resistance (resistivity) is an intrinsic property of the material and does not change with dimensions.
Question 422 Discuss
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An iron nail sinks in water but floats on mercury because:

A
mercury is heavier than iron
B
density of mercury is higher than that of iron
C
density of water is higher than iron
D
iron is a metal

Answer & Explanation

Correct Option: B

An object floats if its density is lower than the liquid; iron is denser than water but less dense than mercury.
Question 423 Discuss
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A geostationary satellite revolves around the Earth from:

A
north to south
B
south to north
C
east to west
D
west to east

Answer & Explanation

Correct Option: D

To remain fixed above a point on the equator, the satellite must orbit in the same direction and period as Earth's rotation.
Question 424 Discuss
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The reason for using a concave mirror as a shaving mirror is that it forms:

A
real and magnified image
B
virtual and magnified image
C
real and diminished image
D
virtual and diminished image

Answer & Explanation

Correct Option: B

When the face is kept between the focus and pole, the mirror produces a large, upright image for detailed shaving.
Question 425 Discuss
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Which of the following works on the basis of the heating effect of current?

A
electric motor
B
electric bell
C
electric iron
D
telephone

Answer & Explanation

Correct Option: C

Electric iron uses a high-resistance heating element (like Nichrome) to convert electrical energy into heat.
Question 426 Discuss
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The time period of a simple pendulum on the moon:

A
decreases
B
increases
C
remains the same
D
becomes zero

Answer & Explanation

Correct Option: B

Time period $T$ is inversely the time period increases.
Question 427 Discuss
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Which physical quantity has the same unit as that of impulse?

A
force
B
momentum
C
power
D
torque

Answer & Explanation

Correct Option: B

Impulse is the change in momentum . Both have the SI unit kg·m/s
Question 428 Discuss
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A piece of ice is floating in a beaker containing water. When the ice melts completely, the level of water will:

A
fall
B
rise
C
remain same
D
first rise then fall

Answer & Explanation

Correct Option: C

Floating ice displaces a volume of water equal to its own weight. When it melts, it turns into that exact volume of water.
Question 429 Discuss
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The clouds float in the atmosphere because of their low:

A
temperature
B
velocity
C
pressure
D
density

Answer & Explanation

Correct Option: D

Clouds consist of tiny droplets or ice crystals with very low terminal velocity and collective density relative to the surrounding air.
Question 430 Discuss
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An electric bulb marked 100W-220V is connected to a 110V supply. The power consumed will be:

A
100 w
B
50 w
C
25 w
D
200 w

Answer & Explanation

Correct Option: C

Power is proportional to $V^2$. If voltage is halved, power becomes $(1/2)^2 = 1/4$ of the original.
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