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 31 Discuss
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What is the frequency (f) of a wave with a period of 0.04 seconds?

A
25 Hz
B
40 Hz
C
100 Hz
D
50 Hz

Answer & Explanation

Correct Option: A

Frequency is the reciprocal of the time period (f = 1/T); therefore, 1 / 0.04 seconds equals 25 Hz.
Question 32 Discuss
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If four resistances of 4 ohm each are connected in parallel, what will be their effective resistance?

A
4 ohm
B
10 ohm
C
1 ohm
D
16 ohm

Answer & Explanation

Correct Option: C

For equal resistances in parallel, the total resistance is R/n; here, 4 ohms divided by 4 resistors equals 1 ohm.
Question 33 Discuss
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Calculate the Body Mass Index (BMI) of a person whose weight is 50 kg and height is 1.5 m.

A
22.2 kg/m2
B
25.0 kg/m2
C
16.6 kg/m2
D
18.0 kg/m2

Answer & Explanation

Correct Option: A

BMI is calculated as weight in kilograms divided by the square of height in meters (50 / (1.5 × 1.5) ≈ 22.22).
Question 34 Discuss
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Which of the following options has all vector quantities?

A
Force, Velocity, Momentum, Energy and Power
B
Force, Velocity, Momentum, Weight and Acceleration
C
Force, Velocity, Momentum, Energy and Acceleration
D
Power, Momentum, Energy, Speed and Work

Answer & Explanation

Correct Option: B

Vector quantities have both magnitude and direction; force, velocity, momentum, weight, and acceleration all satisfy this definition.
Question 35 Discuss
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At 1 bar pressure, the volume of a fixed amount of hydrogen gas is 2.27 litre. What will be the volume if the pressure is kept at 0.2 bar?

A
11.35 cm3
B
12250 cm3
C
11350 cm3
D
10270 cm3

Answer & Explanation

Correct Option: C

By Boyle's Law (P1V1 = P2V2), the new volume is (1 × 2.27) / 0.2 = 11.35 litres, which converts to 11,350 cubic centimeters.
Question 36 Discuss
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Why will a person weigh more at the north or south pole?

A
Due to variation in centripetal force of earth with latitude
B
Due to variation in centrifugal force of earth with latitude
C
Due to Earth's distance from the sun
D
Due to variation in centripetal force of earth with altitude

Answer & Explanation

Correct Option: B

At the poles, the centrifugal force due to Earth's rotation is zero, and the distance to the center of the Earth is slightly less, resulting in higher effective gravity.
Question 37 Discuss
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Four resistors of equal resistance R each are connected. Which of the following values cannot be achieved by using all four?

A
2 R
B
1.33 R
C
0.25 R
D
2.5 R

Answer & Explanation

Correct Option: A

Using all four resistors, common values are 4R (series), 0.25R (parallel), R (two parallel pairs in series), but 2R requires only two resistors in series or specific bridge combinations.
Question 38 Discuss
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Calculate the power of an escalator moving 20 people per minute to a height of 15m (avg mass 50kg, g=10).

A
15 kW
B
150 kW
C
1.25 kW
D
2.5 kW

Answer & Explanation

Correct Option: D

Power = Work/Time. Work = mgh (20 × 50kg × 10 × 15m = 150,000J). Power = 150,000J / 60s = 2,500W or 2.5 kW.
Question 39 Discuss
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When a sailor jumps out of a rowing boat, the boat moves backwards. This represents:

A
the Third law of motion
B
rectilinear motion
C
the First law of motion
D
the Second law of motion

Answer & Explanation

Correct Option: A

This is an application of Newton's Third Law: for every action (the sailor pushing forward), there is an equal and opposite reaction (the boat moving backward).
Question 40 Discuss
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Two masses of 1 kg and 2 kg were dropped from a height of 3.2 metres. Their respective velocities just before touching the ground will be:

A
4 m/s and 8 m/s
B
8 m/s and 4 m/s
C
8 m/s for both
D
3.2 m/s for both

Answer & Explanation

Correct Option: C

The final velocity in free fall depends only on height (v = √(2gh)), so both objects reach 8 m/s regardless of their mass.
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