Q.1) Cooking is quicker in a pressure cooker because
*a) increased pressure raises boiling point
b) steam is not wasted
c) steam cooks food faster
d) water boils at lower temperature
Q.2) When a ship floats on water
a) the weight of water displaced is more than that of The ship
b)The weight of water displaced is less than that of The ship
*c) The weight of water displaced equals that of the ship
d) it displaces no water
Q.3) GSLV project of India is connected to
a) agriculture development
b) conservation of river water
c) banking system
*d) missile engines for space programmes
Q.4) A decibel is
*a) the relative intensity of sound
b) unwanted noise
c) a magnetic assembly in a tape
d) the arm of a record – player
Q.5) An antenna
a) converts short waves into long waves
b) absorbs heat
c) converts heat into light
*d) converts radio waves into electrical signals
Q.6) The ozone layer protects us from
*a) UV radiations
b) Radio waves
c) Visible radiations
d) Infra – red radiations
Q.7) Through a soap film, different colours are seen By white light because of the phenomenon of
*a) Interference
b) reflection
c) diffraction
d) dispersion
Q.8) Sound energy is converted into electrical energy by a
*a) microphone
b) Loud speaker
c) telephone
d) radio
Q.9) Light from the Laser is
*a) monochromatic
b)composite
c) dispersed light
d) incoherent
Q.10) The unit of impedance is
*a) Ohm
b) Farad
c) Henry
d) Volt
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