General Science - Physics MCQs
Physics Objective (Multiple Choice) General Knowledge & General Science Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examinations.
1. “Svedberg Unit” is a unit of _________?
[A] Concentration
[B] Size
[C] Density
[D] Time
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2. By how many times are the Electrostatic forces stronger than the Gravitational Forces for a fixed distance?
[A] 102
[B] 1036
[C] 1012
[D] 2
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Correct Answer: B [1036]
Notes:
Electrostatic forces are 1036 times stronger than the Gravitational Forces for a fixed distance. Electrostatic forces may be attractive or repulsive depending upon the charges. Electrostatic forces are conservative forces and obey inverse square law.
3. Optical Fibre technology works on which of these principles of Physics?
[A] Bernoulli’s Principle
[B] Newton’s law of Motion
[C] Total internal reflection of Light
[D] Photoelectric effect
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Correct Answer: C [Total internal reflection of Light]
Notes:
Optical Fibre technology works on the principle of Total internal reflection of Light. It helps in transmitting light signals from one place to another with a negligible loss of energy, thereby enabling to carry more signals than copper cables.
4. Which of the following is not a valid conservation law of classical Physics?
[A] Law of conservation of energy
[B] Law of conservation of current
[C] Law of conservation of angular momentum
[D] Law of conservation of charge
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Correct Answer: B [Law of conservation of current]
Notes:
The following laws are dealt with in the classical physics: 1. Law of conservation of energy 2. Law of conservation of angular momentum 3. Law of conservation of linear momentum 4. Law of conservation of charge
5. Which of the following scientific discoveries was made by C.V Raman?
[A] Inelastic scattering of light by molecules
[B] Super Conductivity
[C] Controlled nuclear fission
[D] Cyclotron
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Correct Answer: A [Inelastic scattering of light by molecules]
Notes:
C.V Raman discovered the Inelastic scattering of light by molecules in 1928, also named as ‘Raman effect’ Raman scattering is the inelastic scattering of a photon by molecules which are excited to higher vibrational or rotational energy levels. He was the first Indian Physicist to win the Nobel Prize for Physics in 1930. C.V Raman has also been bestowed with the Bharat Ratna Award.
6. Who was the first scientist to discover Electrons?
[A] Albert Einstein
[B] Isaac Newton
[C] J.C. Bose
[D] J.J Thompson
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Correct Answer: D [J.J Thompson]
Notes:
J.J Thompson was the first scientist to discover and identify the electrons and to make the discovery of the first subatomic particle. He was also the first scientist to find evidence for isotopes of a stable (non-radioactive) element in 1913, as part of his exploration into the composition of canal rays (positive ions). His experiments to determine the nature of positively charged particles led to the development of the mass spectrograph. J.J Thompson belonged to United Kingdom. He won the Nobel Prize in Physics in 1906 for his work on the conduction of electricity in gases.
7. Which of the following is NOT a unit for measuring pressure?
[A] bar
[B] torr
[C] Pascal
[D] shake
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Correct Answer: D [ shake ]
Notes:
bar, torr and Pascal are the units used for measuring pressure whereas shake is a unit of time. 1 bar = 105 Pa 1 bar = 760 torr 1 bar = 1 atmospheric pressure Shake is the smallest practical unit of time. 1 shake = 10-8s
8. Which of the following is the unit of Impulse?
[A] N
[B] Ns
[C] N/s
[D] Ns2
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Correct Answer: B [ Ns ]
Notes:
The unit of impulse is Ns. Impulse = Force(N) x Time(s) Impulse can be defined as the integral of a force, F, over the time interval, t, for which it acts.
9. The Atomic clock is based on the periodic vibrations produced in the atom of which element?
[A] Hydrogen
[B] Rubidium
[C] Cesium
[D] Barium
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Correct Answer: C [ Cesium ]
Notes:
The Atomic clock is based on the periodic vibrations produced in cesium atom. The atomic clock is also called as Cesium clock.
10. What is the S.I unit of Coefficient of Mutual inductance?
[A] weber
[B] candela
[C] henry
[D] lambert
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Correct Answer: C [ henry ]
Notes:
The unit of Coefficient of Mutual inductance is henry lambert is the S.I unit of Luminance weber is the S.I unit of Magnetic Flux candela is the S.I unit of Luminous Intensity
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