Q1. One astronomical unit is the average distance between
(a) Earth and the Sun
(b) Earth and the Moon
(c) Jupiter and the Sun
(d) Pluto and the Sun
Q2. Decibel is the unit of
(a) speed of light
(b) intensity of sound
(c) intensity of heat
(d) None of these
Q3. Which of the following is not a vector quantity?
(a) speed
(b) velocity
(c) torque
(d) displacement
Q4. When a steel ball is placed on the surface of mercury, it does not sink because
(a) of the surface tension of mercury
(b) mercury is a semisolid
(c) of the high viscosity of mercury
(d) the density of mercury is greater than that of steel
Q5. Harry Brearley has invented
(a) Electric iron
(b) Electromagnet
(c) Stainless Steel
(d) Gramophone
Q6. The absorption of ink by blotting paper involves
(a) capillary action phenomenon
(b) viscosity of ink
(c) siphon action
(d) diffusion of ink through the blotting
Q7. Light year is a unit of
(a) Time
(b) Light
(c) Distance
(d) Intensity of light
Q8.Pa(Pascal) is the unit for
(a) thrust
(b) pressure
(c) frequency
(d) conductivity
Q9. In vacuum the speed of light depends upon
(a)Wavelength
(b)Velocity of the source of light
(c)Frequency
(d)None of these
Q10. The amount of light reflected depends upon the
(a) Nature of the surface
(b) Smoothness of the surface
(c) Nature of material of object
(d) All of the above
Q11. A well cut diamond appears bright because of
(a) Dispersion
(b) Total internal reflection
(c) Its emit light
(d) Radioactive
Q12. When a ray or light enters a glass slab from air
(a) Its wavelength increase
(b) Its wavelength decrease
(c) Its frequency increase
(d) Both are increases
Q13 "Soap helps in the cleaning of clothes because "
(a) It reduces surface tension
(b) It increases surface tension
(c) It absorbs the dirt
(d) Of some other reason'
Q14 "How is the pressure cooker work? "
(a) Heat cannot escape from the cooker
(b) Low pressure inside the cooker rises the boiling point of water
(c) High pressure inside the cooker rises the boiling point of water
(d) Steam inside the cooker makes food to cook with ease
Q15 "Which one of the following can convert the alternating current into direct current?. "
(a) Transformer
(b) Motor
(c) Dynamo
(d) Rectifier
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