52)Which among the following behaves like hear store house for the earth?
A) Trees
B) Minerals
C) Factories
D) Oceans
View Answer
D) Oceans
Explanation:Oceans absorb and store a large amount of heat, regulating Earth’s climate.Answer:Oceans
53)Pick the correct match
A) A-(ii),B-(iii),C-(i)
B) A-(i),B-(iii),C-(ii)
C) A-(iii),B-(i),C-(ii)
D) A-(ii),B-(i),C-(iii)
View Answer
A) A-(ii),B-(iii),C-(i)
Explanation:Specific heats (approx values):
Water ≈ 4180 J/kg·KGlass ≈ 504 J/kg·KIron ≈ 483 J/kg·K
So:a) Water – (ii)b) Glass – (iii)c) Iron – (i)
Answer: (1) A-(ii), B-(iii), C-(i)
54)Formulation of dew on the surface of a cold soft drink bottle kept in air is due to
A) Evaporation
B) Melting
C) Condensation
D) Freezing
View Answer
C) Condensation
Explanation:Dew formation is due to condensation of water vapor on a cold surface.Answer:Condensation
55)The heat energy supplied to a system during melting is known as
A) specific heat
B) latent heat of vaporization
C) latent heat of fusion
D) humidity
View Answer
C) latent heat of fusion
Explanation:Heat energy used during melting is called latent heat of fusion.Answer:Latent heat of fusion
56)The device used to measure the specific heat of a substance is
A) micrometer
B) spectrometer
C) calorimeter
D) barometer
View Answer
C) calorimeter
Explanation:Instrument used to measure specific heat is the calorimeter.Answer:Calorimeter
57)If I and are the angles of incidence and refraction respectively, then i
A) denser to rarer medium
B) rarer to denser medium
C) throughout denser medium only
D) throughout rarer medium only
View Answer
A) denser to rarer medium
Explanation:If i < r, then the light bends away from normal ⇒ travels from denser to rarer medium.Answer:Denser to rarer medium
58)The physical quantity which has no units, is
A) radius of curvature
B) velocity of light
C) focal length
D) refractive index
View Answer
D) refractive index
Explanation:Refractive index is a ratio, so it has no units.Answer:Refractive index
59)A rectangular tank of depth 2m is full of water of refractive index . When viewed from the top, the bottom of the tank is seen at a depth of
A) 2.66m
B) 1.5m
C) 1.33m
D) 3.33m
View Answer
B) 1.5m
Explanation:Apparent depth = Real depth / Refractive index
60)When we sit at a camp fire, objects beyond the fire are seen swaying. The principle involved in it is
A) refraction
B) reflection
C) total internal reflection
D) dispersion
View Answer
A) refraction
Explanation:Swaying effect due to varying air temperatures → refraction of light.Answer:Refraction
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. When viewed from the top, the bottom of the tank is seen at a depth of