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 411 Discuss
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When an object is placed at infinity in front of a concave mirror, the image is formed at the:

A
center of curvature
B
focus
C
pole
D
behind the mirror

Answer & Explanation

Correct Option: B

Parallel rays from an infinitely distant object converge at the principal focus of a concave mirror.
Question 412 Discuss
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Which of the following transitions in a hydrogen atom emits the photon of highest frequency?

A
n=2 to n=1
B
n=3 to n=2
C
n=4 to n=3
D
n=5 to n=4

Answer & Explanation

Correct Option: A

The energy gap between $n=2$ and $n=1$ is the largest among the given options; higher energy corresponds to higher frequency.
Question 413 Discuss
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The resistance of a conductor is inversely proportional to its:

A
length
B
resistivity
C
area of cross-section
D
temperature

Answer & Explanation

Correct Option: C

Resistance $R =
ho L/A$, where $A$ is the cross-sectional area. Thicker wires have lower resistance.
Question 414 Discuss
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Which among the following is a semiconductor?

A
copper
B
silicon
C
aluminum
D
silver

Answer & Explanation

Correct Option: B

Silicon is a metalloid that has electrical conductivity between that of a conductor and an insulator.
Question 415 Discuss
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The twinkling of stars is due to the phenomenon of:

A
reflection of light
B
atmospheric refraction
C
dispersion of light
D
internal reflection

Answer & Explanation

Correct Option: B

Fluctuations in atmospheric density cause the light from distant stars to bend constantly, changing its apparent position.
Question 416 Discuss
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The energy of the Sun is produced by the process of:

A
nuclear fission
B
nuclear fusion
C
radioactive decay
D
chemical combustion

Answer & Explanation

Correct Option: B

Hydrogen nuclei fuse into helium at extreme temperatures and pressures in the Sun's core, releasing massive energy.
Question 417 Discuss
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In a household electric circuit, appliances are connected in:

A
series
B
parallel
C
mixed circuit
D
neither series nor parallel

Answer & Explanation

Correct Option: B

Parallel connection ensures that each appliance receives the same voltage and can be operated independently.
Question 418 Discuss
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The weight of a body is maximum at the:

A
equator
B
poles
C
center of earth
D
sub-tropics

Answer & Explanation

Correct Option: B

Earth is flattened at the poles, meaning the distance to the center is least, making gravitational acceleration ($g$) strongest there.
Question 419 Discuss
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Which of the following is a property of ultrasonic waves?

A
they can be heard by humans
B
they have frequency less than 20 hz
C
they can be used for cleaning small parts of machinery
D
they travel slower than ordinary sound

Answer & Explanation

Correct Option: C

Ultrasonic waves (>20 kHz) create cavitation in liquids, which effectively removes dirt from complex mechanical components.
Question 420 Discuss
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A metal rod is heated at one end. The heat travels to the other end by the process of:

A
conduction
B
convection
C
radiation
D
diffusion

Answer & Explanation

Correct Option: A

Conduction is the transfer of heat through molecular vibrations and free electron movement in solids without bulk material movement.
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