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SSC CGL Exam  >  SSC CGL Tests  >  Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - SSC CGL MCQ

Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - SSC CGL MCQ


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30 Questions MCQ Test - Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2

Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 for SSC CGL 2024 is part of SSC CGL preparation. The Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 questions and answers have been prepared according to the SSC CGL exam syllabus.The Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 MCQs are made for SSC CGL 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 below.
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Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 1
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Which of the following intermolecular forces is also called the London force?
[SSC CPO 11/11/2022 (Evening)]

Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 1
London forces (dispersion forces, weakest intermolecular force) are the temporary attractive force due to the formation of temporary dipoles in a nonpolar molecule.
Dipole-Induced Dipole Forces - a weak attraction that results when a polar molecule induces a dipole in an atom or in a nonpolar molecule by disturbing the arrangement of electrons in the nonpolar species.
Dipole-Dipole Forces - Appealing force among the polar molecules.
Hydrogen bond forces - An interaction that involves a hydrogen atom.
Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 2
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Which law of Newton provides a quantitative definition of force?
[SSC CGL 12/04/2022 (Morning)]

Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 2
Newton's second law, which states that the force (F) acting on a body is equal to the mass (m) of the body multiplied by the acceleration (a) of its center of mass, F = ma.
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Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 3
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If two forces act on an object from opposite directions, then the magnitude of the net force acting on it is the ______ of the magnitudes of the two forces.
[SSC MTS 11/10/2021 (Morning)]

Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 3
Net force is the sum total of all the forces which are acting on the body. Forces applied on an object in the same direction add to one another.
Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 4
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Among the given options, which one causes an echo?
[SSC MTS 04/09/2023 (1st Shift)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 4
Echo: The sound is heard more than once because of the time difference between the initial production of the sound waves and their return from the reflecting surface. Applications of echo - Measuring Depth and Height, Measuring Distance, Medical Diagnosis.
Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 5
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If an object executes 10 oscillations per second, then its frequency in kilohertz is equal to :
[SSC CPO 23/11/2020 (Evening)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 5

1 kilohertz = 1000 oscillation per second. 10 oscillation per second = 10/1000 = 0.01 kilohertz.

Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 6
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What is the approximate speed of sound in distilled water at 25°C (77°F)?
[SSC CHSL 12/10/2020 (Afternoon)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 6

1498 m/s. The speed of sound in a medium can be determined by the equation: v =(Kp)-1/2 Where , v = speed of sound, K = compressibility and p = density. Speed of sound in air = 343 m/s, Speed of sound in water (at normal temperature and pressure) = 1498 m/s.

Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 7
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What is the velocity of sound in air?
[SSC CGL 07/03/2020 (Evening)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 7
343 m/sec. The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium. At 20°C, the speed of sound in air is about 343 meters per second, or a kilometer in 2.9 s or a mile in 4.7 s.
Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 8
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Who among the following was the first to conclude that in vacuum all objects fall with the same acceleration g and reach the ground at the same time?
[SSC CGL 17/08/2021 (Evening)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 8

Galileo Galilei (father of observational astronomy, modern physics, and the scientific method) is known for his observations of the Moon, phases of Venus, moons around Jupiter, and sunspots. He was the first to conclude that in a vacuum, all objects fall with the same acceleration due to gravity (g) and reach the ground at the same time.

Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 9
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Which instrument was used to detect gravitational waves for the very first time?
[SSC CHSL 17/03/2020 (Evening)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 9

LIGO (Laser Interferometer Gravitational-Wave Observatory) is a large-scale physics experiment and observatory to detect cosmic gravitational waves and to develop gravitational-wave observations as an astronomical tool.

Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 10
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What will be the average kinetic energy per molecule in SI units for an ideal gas at a temperature of 25°C? [SSC CGL Tier II  26/10/2023]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 10

Average kinetic energy (KE) = 3/2KT
Boltzmann constant is = K
Temperature (T) = 25ºC
Value of degree Celsius to Kelvin = T = ºC + 273
T = 25 + 273 ⇒ T = 298 K
The value of Boltzmann constant (K) is 1.38 x 10-23 J/K
Average KE = 3/2KT
Average KE = 3/2(1.38 x 10-23 J/K) (298K)
Average KE = 6.17 x 10-21 J.

Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 11
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What type of energy conversion takes place in a battery?
[SSC MTS 03/05/2023 (Morning)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 11

Chemical energy into electrical energy. Energy conversion devices : Electric Generator - Mechanical energy into electrical energy. Electric motor - Electrical energy into mechanical energy. Microphone - Sound energy into electrical energy. Loudspeaker - Electrical energy into Sound energy. Sitar - Mechanical energy into sound energy.

Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 12
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The given equation describes the _________ relation. s = u t + 1/2 a t²
[SSC CHSL 03/06/2022 (Morning)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 12

Position-time. There are three equations of motion (given by Isaac Newton) that can be used to derive components such as displacement(s), velocity (initial and final), time(t), and acceleration(a).
First: v = u + at (velocity-time),
Second: s = ut + ½ at² (position-time),
Third: v² = u² + 2as (position-velocity).

Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 13
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The English physicist James Prescott Joule outlined the basis of the ______.
[SSC MTS 14/10/2021 (Afternoon)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 13

Principle of conservation. It led to the development of the first law of thermodynamics - Energy can neither be created nor be destroyed, although it may be transformed from one form to another.

Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 14
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Kinetic and potential energies of a body are the components of its ______ energy.
[SSC MTS 18/10/2021 (Evening)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 14
Mechanical (KE + PE).
Kinetic energy (KE) is energy possessed by an object in motion (KE = 1/2 mv²).
Potential energy (PE) is the stored energy that depends upon the relative position of various parts of a system (PE = mgh where m is the mass, g is the acceleration, and h is the height).
Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 15
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Which type of radiation designates a part of the electromagnetic spectrum with frequencies approximately from 300 GHz to 3 kHz, or equivalent, wavelengths approximately from 1 mm to 100km?
[SSC CHSL 30/05/2022 (Morning)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 15
Examples: Cellular Networks, RADAR, Radio Astronomy, Satellite Communication, etc.
Microwave is a form of electromagnetic radiation with wavelengths ranging from about one meter to one millimeter, corresponding to frequencies between 300 MHz and 300 GHz respectively.
Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 16
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What is the rate at which a wave moves through the water, and is measured in knots?
[SSC CHSL 16/04/2021 (Evening)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 16
Wave speed. Wave height is the vertical distance between the trough of a wave and the following crest. Wave crest and trough: A crest is the maximum value of upward displacement within a cycle. A trough is the opposite of a crest, representing the minimum or lowest point in a cycle.
Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 17
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What powers the Earth's internal heat engine?
[SSC CGL 07/12/2022 (1st Shift)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 17
Radioactive energy. The process by which Earth generates heat is called radioactive decay. It involves the disintegration of natural radioactive elements inside the Earth, such as Uranium and Thorium.
Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 18
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Which of the following represents an alpha particle?
[SSC CPO 25/11/2020 (Morning)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 18

Alpha particles consist of two protons and two neutrons bound together into a particle exactly like a helium nucleus. They are generally produced during the process of alpha decay.

Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 19
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Who was famous for publishing a formula in 1827 that shows the mathematical relationship between current, resistance and voltage?
[SSC MTS 12/09/2023 (1st Shift)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 19
Ohm's Law : Voltage (V) = Current (I) x Resistance (R). William Gilbert created the science of magnetism and discovered that the Earth is a magnet. William Watson introduced the Leyden jar. Gustav Kirchhoff and Robert Bunsen discovered two alkali metals, caesium and rubidium.
Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 20
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In 1664, who discovered the fifth star in the Trapezium, an asterism (miniconstellation) in the constellation Orion?
[SSC CGL 06/12/2022 (2nd Shift)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 20
Robert Hooke.
Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 21
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In 1785, who used the calibrated torsion balance to measure the force between electric charges?
[SSC CPO 11/11/2022 (Morning)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 21
RA Millikan determined the magnitude of the electron's charge by Oil drop experiment (1909).
Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 22
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Philosophiæ Naturalis Principia Mathematica, popularly known as Principia, published in 1687, is the great work of which scientist?
[SSC CHSL 06/06/2022 (Evening)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 22
Principia is a work expounding Newton's laws of motion and his law of universal gravitation.
Johannes Kepler (‘Epitome Astronomiae’), John Philoponus (‘Arbiter’), and Edmund Halley (‘The Astronomy Book’).
Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 23
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In 1928, who discovered that when a ray of coloured light enters a liquid, a fraction of the light scattered by that liquid is of a different color?
[SSC CHSL 10/06/2022 (Evening)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 23
C V Raman was awarded the 1930 Nobel Prize in Physics for his discovery of the Raman effect.
Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 24
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What did Wilhelm Conrad Roentgen discover?
[SSC CHSL 19/03/2020 (Afternoon)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 24
Wilhelm Conrad Roentgen was a German mechanical engineer and physicist who in 1895 produced and detected electromagnetic radiation in a wavelength range known as X-rays, an achievement that earned him the first Nobel Prize in Physics in 1901.
Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 25
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Who among the following scientists developed the quantum theory of radiation and proposed that energy is quantized?
[SSC CHSL 20/10/2020 (Afternoon)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 25
Louis de Broglie (Physics 1929, discovery of the wave nature of electrons).
Werner Heisenberg (Physics 1932, Creation of quantum mechanics).
James Chadwick (Physics 1935, Discovery of the neutron).
Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 26
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Which of the following is the correct statement?
[SSC CPO 03/10/2023 (Afternoon)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 26
Some other SI Units:
Energy - Joule, Power - Watt, Force or Weight - Newton, Frequency - Hertz, Resistance - Ohm.
Seven Fundamental quantities with their units:
Length (meter), Mass (kilogram), Time (second), Electric current (ampere), Thermodynamic temperature (kelvin), Amount of substance (mole), Luminous intensity (candela).
Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 27
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Which of the following is an INCORRECT match?
[SSC CPO 04/10/2023 (Afternoon)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 27
SI Units:
-Volume - cubic metre (m³).
-Length - metre (m).
-Mass - kilogram (kg).
-Time - second (s).
-Amount of substance - mole (mol).
-Luminous intensity - candela (cd).
-Electric current - ampere (A).
-Thermodynamic temperature - kelvin (K).
-Frequency - hertz (Hz).
-Electric charge - coulomb (C).
-Electric potential (Voltage) - volt (V).
-Inductance - henry (H).
-Capacitance - farad (F).
-Resistance - ohm (Ω).
-Electrical conductance - siemens (S).
-Magnetic flux density - tesla (T).
-Power, Radiant flux - watt (W).
-Angle - radian (rad).
Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 28
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1 kilowatt is equivalent to:
[SSC CPO 05/10/2023 (Morning)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 28
1 kilowatt-hour is defined as the energy consumed by a device of power 1 kilowatt in 1 hour. A kilowatt is a unit of Electric Power.
1 kW = 1000 watts,
Watt = Joule/second,
1 Horsepower = 746 watts.
Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 29
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The number of significant figures in 0.05800 are : [SSC CHSL 08/08/2023 (4th shift)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 29

First rule is that all non-zero digits are considered as significant. The second rule is that Zeros between non-zero digits are also considered as significant. Example -4.5006 has five significant figures. The third rule can be given as, Zeroes at the end or on the right side of the number are also significant. Example - 0.500 has three significant figures.

Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 30
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A non-SI unit called ‘nit’ is the unit of which of the following photometric quantities used to measure a multitude of light intensity?
[SSC CGL 18/07/2023 (3rd shift)]
Detailed Solution for Test: SSC CGL Previous Year Questions: Physics (2023-20) - 2 - Question 30
Nit is the non-SI unit for luminance. One lux is the amount of illumination provided when one lumen is evenly distributed over an area of one square meter. The candela is the unit of luminous intensity.
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