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A falling drop of rain water ac-quires the spherical shape due to – (1) Viscosity (2) Surface Tension (3) Atmospheric pressure (4) Gravitational force
Which one of the following instruments is used to study dispersion of light? (1) Microscope (2) Telescope (3) Spectrometer (4) Photometer
Radio waves, microwaves, infra-red spectrum, ultraviolet rays, X-rays and gamma rays are classified as (1) light waves (2) clectromagnctic waves (3) clectric waves (4) magnetic waves
The fourth state of matter is known as (1) Gas (2) Vapour (3) Plasma (4) Electrons
Good conductor of electricity is – (1) dry air (2) paper (3) kerosene (4) graphite
When the barometer reading dips suddenly, it is an indication of – (1) Hot weather (2) Calm weather (3) Storm (4) Dry weather
Energy is continuously created in the sun due to – (1) Nuclear fusion (2) Nuclear fission (3) Radioactivity (4) Artificial radioactivity
Which among the following waves is used for communication by artificial satellites? (1) Micro waves (2) Radio waves (3) A. M. (4) Frequency of 1016 series
Which among the following types of coal produces most heat per unit? (1) Coal (2) Lignite (3) Anthracite (4) Pit
When a body falls from an aeroplane, there is increase in its – (1) Kinetic encrgy (2) Mass (3) Acceleration (4) Potential energy
Water is not suitable as a calorimetric substance because it – (1) has high specific heat (2) is a good conductor (3) has high boiling point (4) low latent heat of vaporization