Q) Cryogenic engines find application in
(a)washing machine
(b)frost free refrigerator
(c)rocket technology
(d)sub-marine propulsion
Q) "Consider the following machines
I. Hydraulic lift
II. Aneroid barometer Which of the machines given above is/are working on the "" Pascal's law”?.
"
(a) Only I
(b) Only II
(c) Both I and II
(d) Neither I nor II
Q) "A liquid is kept in a regular cylindrical vessel up to a certain height. If this vessel is replaced by another cylindrical vessel having half the area of cross-section of the bottom, the pressure on the bottom will
"
(a)remain unaffected
(b)be reduced to half the earlier pressure
(c)be increase to twice the earlier pressure
(d)be reduced to one-fourth the earlier pressure
Q) Which one of the following reactions is the main cause of the energy radiation from the sun?.
(a)Fusion reaction
(b) Fission reaction
(c)Chemical reaction
(d)Diffusion reaction
Q) "When light enters from air to water, then its
"
(a)Frequency increases and speed decreases
(b)Frequency is same but the wavelength is smaller in water than in air
(c)Frequency is same but the wavelength is greater in water than in air
(d)Frequency is decreases but the wavelength is smaller in water than in air
Q) "Which one of the following statements is correct?
"
(a)Both electron and neutron reside inside the nucleus
(b)Both electron and proton reside inside the nucleus
(c)Both proton and neutron reside inside the nucleus
(d)Only electron resides inside the nucleus
Q) "Optical fibre mainly used in communication is based on
"
(a)less absorption coefficient
(b)less scattering
(c)total internal reflection
(d)refraction
Q) Confirmation of the presence of Higgs Boson will justify
(a)both the standard model and superstring theory
(b)the unification of all the four fundamental forces
(c)the steady-state model of the universe
(d)the mass of the fundamental practice
Q) "Mirage is a phenomenon due to
"
(a) reflection of light
(b) refraction of light
(c)total internal reflection of light
(d)total diffraction of light
Q) "The blackboard seems black because it
"
(a)Reflects every colour
(b)Does not reflect any colour
(c)Absorbs black colour
(d)Reflects black colour
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