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 101 Discuss
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What is the value of acceleration due to gravity at the center of the Earth?

A
9.8 m/s sq
B
Infinity
C
Zero
D
4.9 m/s sq

Answer & Explanation

Correct Option: C

At the center of the Earth, the gravitational pull from all directions cancels out completely. Therefore, the net acceleration due to gravity is zero.
Question 102 Discuss
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Light year is a unit of measurement for which physical quantity?

A
Time
B
Speed of light
C
Distance
D
Intensity of light

Answer & Explanation

Correct Option: C

A light-year is the distance that light travels in a vacuum in one Julian year. It is widely used in astronomy to measure vast interstellar distances.
Question 103 Discuss
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What is the energy possessed by a body due to its motion called?

A
Potential Energy
B
Thermal Energy
C
Kinetic Energy
D
Mechanical Energy

Answer & Explanation

Correct Option: C

Kinetic energy is the energy that an object possesses due to its motion. It is mathematically given by the formula 1/2 mv^2.
Question 104 Discuss
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The splitting of white light into its component colors is known as what?

A
Refraction
B
Diffraction
C
Dispersion
D
Reflection

Answer & Explanation

Correct Option: C

Dispersion is the phenomenon where white light splits into its constituent spectrum of colors (VIBGYOR) when passing through a prism. This occurs because different colors travel at different speeds in the glass.
Question 105 Discuss
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What is the escape velocity on the surface of the Earth?

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

Answer & Explanation

Correct Option: B

The escape velocity on Earth's surface is approximately 11.2 km/s. It is the minimum velocity required by an object to overcome Earth's gravitational pull indefinitely.
Question 106 Discuss
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In which medium is the speed of sound maximum?

A
Vacuum
B
Air
C
Water
D
Steel

Answer & Explanation

Correct Option: D

Sound travels fastest in solids because the molecules are densely packed together, allowing sound waves to transfer kinetic energy efficiently. Thus, it is maximum in steel compared to liquids or gases.
Question 107 Discuss
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Which type of lens is used to correct myopia?

A
Convex lens
B
Concave lens
C
Cylindrical lens
D
Bifocal lens

Answer & Explanation

Correct Option: B

Myopia, or short-sightedness, is an eye defect corrected by using a concave lens. The concave lens diverges the incoming light rays so that the image forms correctly on the retina.
Question 108 Discuss
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The filament of an electric bulb is typically made of which metal?

A
Copper
B
Silver
C
Tungsten
D
Aluminum

Answer & Explanation

Correct Option: C

The filament of a light bulb is made of tungsten because it has an exceptionally high melting point (around 3422 °C). This allows it to glow white-hot without melting.
Question 109 Discuss
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Which device converts mechanical energy into electrical energy?

A
Electric Motor
B
Electric Generator
C
Transformer
D
Galvanometer

Answer & Explanation

Correct Option: B

An electric generator or dynamo operates on electromagnetic induction and converts mechanical energy into electrical energy. In contrast, an electric motor does the exact opposite.
Question 110 Discuss
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What is the force of attraction between molecules of different substances called?

A
Cohesive force
B
Gravitational force
C
Magnetic force
D
Adhesive force

Answer & Explanation

Correct Option: D

Adhesive force refers to the attractive forces between unlike molecules. Cohesive force, on the other hand, is the attraction between like molecules.
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