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 91 Discuss
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5 stones were dropped from the top of a building. They all fell to the ground in straight lines. What can be said about their motion?

A
They had rectilinear motion
B
They had curvilinear motion
C
They had slow motion
D
They had gravity free motion

Answer & Explanation

Correct Option: A

Rectilinear motion is a type of linear motion in which the direction of velocity remains constant and the path is a straight line.
Question 92 Discuss
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What balances the atmospheric pressure with equal force so that animals do not crumble under the high pressure exerted on them by the atmosphere?

A
Moon's gravitational pull
B
Pressure because of sunlight
C
Energy produced by the food consumed
D
Blood Pressure

Answer & Explanation

Correct Option: D

The pressure exerted by fluids inside an organism's body, like blood and air in the lungs, balances the external atmospheric pressure.
Question 93 Discuss
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In electricity overloading cannot be caused by:

A
connecting too many appliances to a single socket
B
accidental hike in the supply voltage
C
the live wire coming in direct contact with the neutral wire
D
the live wire and the neutral wire coming into contact through a heavy resistance

Answer & Explanation

Correct Option: D

High resistance limits the flow of current; therefore, contact through a heavy resistance will not lead to the high current surge typical of overloading.
Question 94 Discuss
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In 1800, which of the following experimental achievements was made by William Nicholson?

A
Discovery of water electrolysis
B
Discovery of thermionic emission
C
Discovery of low-cost filters for polarizing light
D
Discovery of electric bulb

Answer & Explanation

Correct Option: A

William Nicholson and Anthony Carlisle discovered water electrolysis in 1800 by using a voltaic pile to decompose water into hydrogen and oxygen.
Question 95 Discuss
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Otto von Guericke was the most prominent person known for which invention in the 17th century?

A
Air pump
B
Barometer
C
Fluorescent electric lamp
D
Diesel engine

Answer & Explanation

Correct Option: A

In 1650, Otto von Guericke invented the vacuum pump, which he used to demonstrate the effects of air pressure with the famous Magdeburg hemispheres.
Question 96 Discuss
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What is the SI unit of power of a lens?

A
Meter
B
Dioptre
C
Watt
D
Joule

Answer & Explanation

Correct Option: B

The SI unit of power of a lens is Dioptre (D). It is defined as the reciprocal of the focal length of the lens measured in meters.
Question 97 Discuss
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Which device is used to measure electric current in a circuit?

A
Voltmeter
B
Galvanometer
C
Ammeter
D
Potentiometer

Answer & Explanation

Correct Option: C

An ammeter is an instrument used to measure the electric current flowing through a circuit. It is always connected in series with the circuit.
Question 98 Discuss
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The phenomenon of mirage is due to which property of light?

A
Interference
B
Diffraction
C
Total Internal Reflection
D
Scattering

Answer & Explanation

Correct Option: C

Mirage is an optical illusion observed in deserts or hot roads due to the total internal reflection of light. It happens when light passes through layers of air with different temperatures and densities.
Question 99 Discuss
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Twinkling of stars is primarily due to which optical phenomenon?

A
Atmospheric Refraction
B
Dispersion of light
C
Internal Reflection
D
Tyndall effect

Answer & Explanation

Correct Option: A

Stars twinkle because their light undergoes continuous atmospheric refraction as it passes through the varying densities of Earth's atmosphere. This causes the apparent position and brightness of the star to fluctuate.
Question 100 Discuss
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Which instrument is used to measure atmospheric pressure?

A
Hygrometer
B
Barometer
C
Manometer
D
Lactometer

Answer & Explanation

Correct Option: B

A barometer is a scientific instrument used to measure atmospheric pressure in a specific environment. The most common type is the mercury barometer.
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