Which of the following is not a unit of time? (a) second (b) parsec (c) year (d) light year
Parsec and light year are not the units of time. They are practical units which are used to measure large... View Article
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What is the dimensional formula of angular momentum?
The dimensional formula of angular momentum is given by, M1 L2 T-1 Where, M = Mass L = Length T... View Article
A works twice as fast as B. If B can complete a work in 12 days independently then the number of days in which A and B can together finish the work is?
Given, A works twice as fast as B Thus, the ratio of work done by A and B will be... View Article
Distance is a scalar quantity give reason.
Distance is a scalar quantity because it has magnitude only. Distance is a directionless quantity.
Convert 25 degree Celsius into Fahrenheit.
To convert: 25 degree Celsius into Fahrenheit By the formula, we know; (C × 9/5) + 32 = F Therefore, ... View Article
Name the device used to measure potential difference.
The device used to measure potential difference is called Voltmeter.
Photoelectric effect shows?
The photoelectric effect shows that the energy required to release the electrons from the surface of the metal depends on... View Article
What is a compass ? How is a compass used to find directions ?
The magnetic compass is a simple device, which has been used from the ancient times by the sailors and other... View Article
What is Hypermetropia? How it is corrected?
Hypermetropia is also referred to as hyperopia or long-sightedness or far-sightedness. Hypermetropia is the condition of the eyes where the... View Article
Basic source of magnetism (a) Charged particles alone (b) Movement of charged particles (c) Magnetic dipoles (d) Magnetic domains
Answer: (b) Movement of charged particles
What are the factors affecting the height of the waves?
The factors affecting the height of the waves are the Speed of the Wind, earthquakes, Volcanic eruptions and Underwater landslides.
Define angle of prism?
The angle formed due to two lateral faces of the prism is known as the angle of prism. The two... View Article
A mirror forms a virtual image of a real object: (A) it must be a convex mirror. (B) it must be concave mirror. (C) it must be a plane mirror. (D) it may be plane or convex mirror
Answer: (D) it may be plane or convex mirror
The mass of an physical object is:
The mass of a physical object is the amount of matter in an object. It does not change at any... View Article
From a cliff of 49m high, a man drops a stone. One second later, he throws another stone. They both hit the ground at the same time. Find out the speed with which he threw the second stone.
For first stone h = 49 m g = 9.8 m/s2 t = 0 u = 0 We know that,... View Article
5 difference between clinical and laboratory thermometer
The differences between clinical and laboratory thermometer are as follows: Clinical thermometer (a) Temperature range is 350 to 420C (b)... View Article
The dimension formula of thermal conductivity K given relation , Q = K
Thermal conductivity is defined as the transportation of energy due to the random movement of molecules across the temperature gradient.... View Article
Aluminium crystallises in a cubic closepacked structure. Its metallic radius is 125 pm. (i) What is the length of the side of the unit cell? (ii) How many unit cells are there in 1.00 cm3 of aluminium?
Given, Aluminium crystallises in a cubic close-packed structure. Its metallic radius is 125 pm. (i) Length of the side of... View Article
Which among the following is the smallest unit of length? A. Micron. B. Fermi. C. Angstrom. D. Nanometre.
Answer: B. Fermi. 1Fm = 10– 15m
Volume of gas at STP is 1.12 ×10^-7cc .Find number of molecule in it.
Given, Volume of gas at STP = 1.12 ×10-7cc One mole of gas occupies 22400 ml of volume Avogadro number,... View Article
