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 1 Discuss
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What is the SI unit of current?

A
Ohm
B
Ampere
C
Metre
D
Volt

Answer & Explanation

Correct Option: B

The Ampere is the base SI unit of electric current, named after André-Marie Ampère, one of the main founders of the science of classical electromagnetism.
Question 2 Discuss
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What is the unit of measurement for optical power of the lens?

A
Yotta
B
Katal
C
Radian
D
Diopter

Answer & Explanation

Correct Option: D

The diopter is the unit of refractive power of a lens, defined as the reciprocal of the focal length in meters.
Question 3 Discuss
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What is the unit of specific resistance?

A
Farad
B
Ampere
C
Coulomb
D
Ohm meter

Answer & Explanation

Correct Option: D

Specific resistance, or resistivity, is measured in ohm-meters (Ω·m) and represents the resistance of a material with unit cross-sectional area and unit length.
Question 4 Discuss
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Which famous experiment was done by Michael Faraday in 1831?

A
Discovery of Electromagnetic Induction
B
Periodic motion - Hands of a clock
C
Oscillatory motion - Earth moving around the sun
D
Rotatory motion - blades of a fan

Answer & Explanation

Correct Option: A

In 1831, Faraday discovered electromagnetic induction, proving that a changing magnetic field can induce an electric current in a conductor.
Question 5 Discuss
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Which of the following two quantities have the same dimensions?

A
Work and torque
B
Power and moment of inertia
C
Work and angular displacement
D
Power and radius of circular motion

Answer & Explanation

Correct Option: A

Both work and torque have the dimensional formula [ML²T⁻²], as work is force times distance and torque is force times perpendicular distance.
Question 6 Discuss
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What happens when two forces act in the opposite directions on an object?

A
The net force acting on the object is the difference between the two objects.
B
The net force acting on the object is the difference between the two forces.
C
The net force acting on the object is the total of the two forces.
D
The net force acting on the object is the sum of the two objects.

Answer & Explanation

Correct Option: B

According to vector addition, when forces act in exactly opposite directions, the magnitude of the resultant force is found by subtracting the smaller force from the larger one.
Question 7 Discuss
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Name the phenomenon where an opaque object on the path of light becomes very small and where light has a tendency to bend around it and not walk in a straight line.

A
Reflection of light
B
Diffraction of light
C
Angle of refraction
D
Angle of incidence

Answer & Explanation

Correct Option: B

Diffraction is the slight bending of light as it passes around the edge of an object or through an opening, highlighting the wave nature of light.
Question 8 Discuss
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If a bar magnet is hung from a string, in which direction does its north pole point?

A
West
B
North
C
East
D
South

Answer & Explanation

Correct Option: B

A freely suspended magnet always aligns itself with the Earth's magnetic field, with its north-seeking pole pointing toward the geographic North Pole.
Question 9 Discuss
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In the context of vernier calliper, an internal jaw is used to measure:

A
silver
B
platinum
C
Internal diameter
D
cesium

Answer & Explanation

Correct Option: C

Vernier calipers have two sets of jaws; the upper, smaller jaws are specifically designed to measure the internal dimensions of objects like tubes or holes.
Question 10 Discuss
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with good thermal An electric iron requires a fuse to prevent short circuiting.

A
4 A
B
3 A
C
2 A
D
5 A

Answer & Explanation

Correct Option: D

Standard domestic electric irons typically consume around 1000W-1200W, making a 5A fuse the appropriate safety rating for a 220-240V supply.
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