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 371 Discuss
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In a vacuum, if a feather and an iron ball are dropped from the same height simultaneously, which will reach the ground first?

A
the iron ball
B
the feather
C
both will reach at the same time
D
depends on the atmospheric pressure

Answer & Explanation

Correct Option: C

In a vacuum, there is no air resistance; hence, all objects accelerate at the same rate ($g$) regardless of their mass.
Question 372 Discuss
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A convex mirror is commonly used as a rear-view mirror in vehicles because:

A
it produces a real and inverted image
B
it has a wider field of view than a plane mirror
C
it produces a magnified image
D
it is cheaper to manufacture

Answer & Explanation

Correct Option: B

Convex mirrors produce diminished, erect images, allowing the driver to see a larger area of traffic behind them.
Question 373 Discuss
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The escape velocity on the surface of the Earth is approximately:

A
9.8 km/s
B
11.2 km/s
C
7.9 km/s
D
1.12 km/s

Answer & Explanation

Correct Option: B

Escape velocity is the minimum speed needed for an object to break free from Earth's gravitational pull without further propulsion.
Question 374 Discuss
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Which of the following determines the pitch of a sound wave?

A
amplitude
B
frequency
C
velocity
D
loudness

Answer & Explanation

Correct Option: B

Pitch is the brain's perception of the frequency of sound; higher frequency results in a higher pitch.
Question 375 Discuss
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X-rays are which type of waves?

A
longitudinal mechanical waves
B
transverse electromagnetic waves
C
matter waves
D
stationary waves

Answer & Explanation

Correct Option: B

X-rays are a form of high-energy electromagnetic radiation, consisting of oscillating electric and magnetic fields.
Question 376 Discuss
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When a bar magnet is cut into two equal halves along its length, the pole strength of each piece:

A
becomes double
B
becomes half
C
remains the same
D
becomes zero

Answer & Explanation

Correct Option: B

Cutting a magnet longitudinally reduces the cross-sectional area of the poles, thereby halving the pole strength.
Question 377 Discuss
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The phenomenon of electromagnetic induction was discovered by:

A
james clerk maxwell
B
michael faraday
C
heinrich hertz
D
isaac newton

Answer & Explanation

Correct Option: B

Faraday discovered that a changing magnetic field through a conductor induces an electromotive force (EMF).
Question 378 Discuss
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An object is placed at the center of curvature of a concave mirror. The image formed will be:

A
virtual and erect
B
real and of the same size
C
real and magnified
D
virtual and diminished

Answer & Explanation

Correct Option: B

When the object is at $C$, the image is formed at $C$, is real, inverted, and exactly the same size as the object.
Question 379 Discuss
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If the length of a simple pendulum is quadrupled, its time period will:

A
be doubled
B
be halved
C
remain the same
D
increase by four times

Answer & Explanation

Correct Option: A

The time period $T$ is proportional to the square root of length
Question 380 Discuss
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Which of the following is an example of a scalar quantity?

A
displacement
B
velocity
C
force
D
electric potential

Answer & Explanation

Correct Option: D

Electric potential is work done per unit charge and has no direction, making it a scalar quantity.
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