1) Boiling takes place from a) Surface of liquid b) Throughout the liquid c) From the mid-portion of the liquid 2) The ray of light moving from an optically rarer to denser medium a) Bends away from the normal b) B. Bends toward the normal c) C. Remains undeviated 3) The property of splitting of white light ray into its seven constituent colours is known as: a) Spectrum b) Refractive index c) Dispersion 4) Rainbows are formed due to a) Reflection of light b) B. Refraction of light c) C. Dispersion of light 5) The speed of light in air or vacuum is a) 330 m/s b) 3 x10 8  m/s c) 332 m/s 6) Heat is _____________ during boiling a) Absorbed b) Released c) Both of them 7) The increase in length of a metal rod depends on a) The initial length of the rod only b) The rise in temperature only c) The material of rod only d) All the above 3 factors 8) The material used in a pendulum of a clock a) Pyrex glass b) Invar c) Alnico 9) Alcohol expands _________ than water a) Both are equal b) Less c) More 10) The boiling point of a liquids is increased by  a) increasing the volume of liquid b) increasing the pressure , on liquids  c) decreasing pressure on liquids 11) The perpendicular distance between the incident ray and emergent ray is called a) Lateral displacement b) parallel shift c) None of these 12) In a transparent medium, which coloured light has maximum speed a) Violet b) Yellow c) Red 13) When a ray of light falls normally on the surface separating the two media, it will pass a) away from the normal b) towards the normal c) undeviated 14) A coin in water appears to be raised. this is due to which phenomenon? a) Reflection of light b) Refraction of light c) Dispersion of light 15) If we heat two rods of the same metal and of the same length, but one is hollow and the other is solid, to the same rise in temperature, then which rod will expand more? a) Solid rod b) hollow rod c) Both expand to the same extent

Quiz- Class 8

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