# Class 11th Physics 1 – Physical world MCQs

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5.00 mm

#### Wave theory of light was proposed by ____.

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Different scientists proposed different theories to explain the nature of light. The wave theory of light was proposed by Christian Huygen.

#### Which of the following is a dimensionless constant

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A quantity has dimensional and also has a constant value is called dimensional constant. Therefore, gravitational constant (G) is a dimensional constant.

#### The unit of resistance is

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The ohm (symbol: Ω)is the SI derived unit of electrical resistance.

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#### Which of the following quantities is dimensionless

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All quantities have dimensions

#### Which of the following force is the weakest force?

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Among all the fundamental forces, gravitational force is the weakest force. The gravitation force is 10−39 times the strong nuclear force.

#### Which of the two have same dimensions

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Angular velocity and frequency

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18,2

#### The unit of permittivity of free space, ε0 is

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coulomb2/ newton-metre2

#### Electromagnetic waves were first generated by ____.

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Maxwell theoretically explained the existence of electromagnetic waves, but the electromagnetic waves were first generated in the laboratory by H Rudolf Hertz.

#### Steam engine works on the principle of ____.

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Steam engine works on the principle of laws of thermodynamics.

#### The principle used in rocket propulsion is ____.

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The principle used in rocket propulsion is Newton's laws of motion. It works on the principle like for every action there is an equal and opposite reaction .When the gases are ejected down after combustion as an opposite reaction, the rocket moves upward.

#### The dimensions of pressure is equal to

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Energy per unit volume

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18, 2

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[ML-1T -1]

#### Physics is derived from the Greek word ____.

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The word physics is derived from the Greek word, "Fusis".

#### Which of the following is not a fundamental force in nature?

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There four fundamental forces in the nature . They are Gravitational force, Electromagnetic force, Weak nuclear force and strong nuclear force. Thus the molecular force is not a fundamental force.

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6.63 x 10-34 Js

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X/Y

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[M-1L3T-2]

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Torque and work

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Distance

#### [ML-1T-2] is the dimensional formula of

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modulus of elasticity

#### Which one of the following bonds produces a solid that reflects light in the visible region an whose electrical conductivity decreases with temperature and has high melting point?

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Metallic bonding is formed due to the attraction of valence (free) electrons with the positive ion cores. Their conductivity decreases with rising of temperature. When visible light falls on a metallic crystal, the electrons of atoms absorb visible light, so they are opaque to visible light. However, some orbital electrons absorb energy and reach to an excited state. They then return to their normal state, remitting light of the same frequency.

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10m, 4kg, 2s

#### Number of base SI units are-

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7(metre, length, kilogram, mass, second, ampere, electric current, Kelvin, temperature, candela and mole)

#### Optical fibres works on the principle of ____.

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Optical fibres works on the principle of total internal reflection. The optical fibres are mainly used in communication. It transfers the energy for long distances without any loss of energy.

#### Which of the following study do not comes under Microscopic domain?

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The study about molecular, atomic and nuclear phenomena comes under Microscopic domain. It involves the study about the atoms, molecules and fundamental particles, which are very small. Whereas the phenomenon at astronomical scale comes under Macroscopic domain.

#### Choose the wrong statement(s)

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A dimensionally incorrect equation may be incorrect

Class 11th Physics 1 - Physical world MCQs
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