Which of the following is a dimensionless constant
A quantity has dimensional and also has a constant value is called dimensional constant. Therefore, gravitational constant (G) is a dimensional constant.
Radium was discovered by _______ .
The radioactive element radium was discovered by Marie Curie.
The principle used in rocket propulsion is ____.
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.
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?
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.
Which of the following quantities is dimensionless
All quantities have dimensions
If the units of force, energy and velocity are 10 N, 100 J and 5 ms–1 , the units of length, mass and time will be
10m, 4kg, 2s
Two quantities X and Y have different dimensions. Which mathematical operation given below is physically meaningful?
X/Y
Two vectors having magnitudes 8 and 10 can have maximum and minimum value of magnitude of their resultant as:
18,2
Number of base SI units are-
7(metre, length, kilogram, mass, second, ampere, electric current, Kelvin, temperature, candela and mole)
The unit of resistance is
The ohm (symbol: Ω)is the SI derived unit of electrical resistance.
The dimensions of universal gravitational constant are
[M-1L3T-2]
The value of Planck’s constant is
6.63 x 10-34 Js
Electromagnetic waves were first generated by ____.
Maxwell theoretically explained the existence of electromagnetic waves, but the electromagnetic waves were first generated in the laboratory by H Rudolf Hertz.
Wave theory of light was proposed by ____.
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 study do not comes under Microscopic domain?
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.
Light year is a unit of
Distance
The dimensions of pressure is equal to
Energy per unit volume
Two vectors having magnitudes 8 and 10 can have maximum and minimum value of magnitude of their resultant as:
18, 2
Identify the pair whose dimensions are equal
Torque and work
The dimensional formula of coefficient of viscosity is
[ML-1T -1]
Steam engine works on the principle of ____.
Steam engine works on the principle of laws of thermodynamics.
Which of the following measurements is most precise?
5.00 mm
Optical fibres works on the principle of ____.
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 force is the weakest force?
Among all the fundamental forces, gravitational force is the weakest force. The gravitation force is 10−39 times the strong nuclear force.
Physics is derived from the Greek word ____.
The word physics is derived from the Greek word, "Fusis".
[ML-1T-2] is the dimensional formula of
modulus of elasticity
Which of the two have same dimensions
Angular velocity and frequency
The unit of permittivity of free space, ε0 is
coulomb2/ newton-metre2
Which of the following is not a fundamental force in nature?
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.
Choose the wrong statement(s)
A dimensionally incorrect equation may be incorrect
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