Physics
Complete the following by choosing the correct answers from the bracket :
(a) A …………… [Class II / Class III] lever will always have M.A. > 1.
(b) A boy uses a GPS device to locate his missing friend in a crowded area; the system primarily uses …………… [ultraviolet waves / microwaves] to track the location.
(c) Unit of specific heat capacity is …………… . [kg2m2s-2K-1 / m2s-2K-1]
(d) The threshold of hearing is …………… . [0 dB / 20 Hz]
(e) Two copper wires can have different resistivity if they have different …………… . [lengths / temperatures]
(f) The reaction responsible for the production of energy in the sun is …………… . [Nuclear Fusion / Nuclear Fission]
Answer
(a) A class II lever will always have M.A. > 1.
(b) A boy uses a GPS device to locate his missing friend in a crowded area; the system primarily uses microwaves to track the location.
(c) Unit of specific heat capacity is m2s-2K-1.
(d) The threshold of hearing is 0 dB.
(e) Two copper wires can have different resistivity if they have different temperatures.
(f) The reaction responsible for the production of energy in the sun is Nuclear Fusion.
Related Questions
The amount of heat energy required to melt a given mass of a substance at its melting point without any rise in its temperature is called as the :
- specific heat capacity
- specific latent heat of fusion
- latent heat of fusion
- specific latent heat of freezing
A nucleus of an atom consists of 146 neutrons and 95 protons. It decays after emitting an alpha particle. How many protons and neutrons are left in the nucleus after an alpha emission?
- protons = 93, neutrons = 142
- protons = 95, neutrons = 144
- protons = 93, neutrons = 144
- protons = 95, neutrons = 142
Match the movement of the body part in Column A to the class of lever in Column B.
Movement of the body part (Column A) Class of lever (Column B) (a) Nodding head • Class III (b) Lifting body weight on your toes • Class II • Class I (a) Name the waves used for echo depth sounding.
(b) Give one reason for their use in the above application