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Why is water used as a coolant in radiators of a car?
Concept: Specific Heat Capacity
Specific heat capacity of a substance X is 1900 Jkg-1°C-1 means ______.
Concept: Specific Heat Capacity
Thermal capacities of substances A and B are same. If mass of A is more than mass of B then:
Which substance will have more specific heat capacity?
Concept: Specific Heat Capacity
Why does it become pleasantly warm when the lakes start freezing?
Concept: Melting and Freezing
Water freezes to form ice. What change would you expect in the average kinetic energy of the molecules?
Concept: Explanation of Latent Heat of Melting based on Kinetic Model
What mass of ice at 0°C added to 2.1 kg water, will cool it down from 75°C to 25°C? Given Specific heat capacity of water = 4.2 Jg-1 °C-1, Specific latent heat of ice = 336 Jg-1.
Concept: Specific Heat Capacity of Some Common Substances
Name the radiations which are absorbed by greenhouse gases in the earth’s atmosphere.
Concept: Radioactivity
A radiation X is focused by a particular device on the bulb of a thermometer and mercury in the thermometer shows a rapid increase. Name the radiation X
Concept: Radioactivity
Answer the following questions based on a hot cathode ray tube
Name the charged particles
Concept: Radioactivity
Answer the following questions based on a hot cathode ray tube.
State the approximate voltage used to heat the filament
Concept: Radioactivity
Answer the following questions based on a hot cathode ray tube.
What will happen to the beam when it passes through the electric field?
Concept: Radioactivity
State three factors on which the rate of emission of electrons from a metal surface depends
Concept: Radioactivity
Why do Free electrons not leave the metal surface on their own
Concept: Radioactivity
How can they be made to leave the metal surface? (State any two ways)
Concept: Radioactivity
An element `""_ZS^A` decays to `""_85R^222` after emitting 2 α particles and 1 β particle.
Find the atomic number and atomic mass of the element S.
Concept: Radioactivity
A radioactive substance is oxidized. Will there be any change in the nature its radioactivity? Give a reason for your answer
Concept: Radioactivity
Arrange α, β, and γ rays in ascending order with respect to their
1) Penetrating power.
2) Ionising power
3) Biological effect
Concept: Radioactivity
In a cathode ray tube, what is the function of anode?
Concept: Radioactivity
State the energy conversion taking place in a cathode ray tube
Concept: Radioactivity
