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Solar Radiation, Heat Balance and Temperature Class 11 MCQs Questions with Answers
I. Choose the correct answer
Question 1.
Name the sphere which constitutes the earth.
(a) atmosphere
(b) hydrosphere
(c) organic biosphere
(d) lithosphere
Answer
Answer: (a) atmosphere.
Question 2.
Earth receives almost all its energy from the
(a) sun
(b) moon
(c) stars
(d) none of these
Answer
Answer: (a) sun.
Question 3.
What is the temperature at the sun’s gaseous surface?
(a) 570 degree Celsius
(b) 5700 degree celcius
(c) 57000 degree Celsius
(d) 5000 degree celcius
Answer
Answer: (b) 5700 degree Celsius.
Question 4.
Bodies radiate energy in which form?
(a) light
(b) wave
(c) particles
(d) none of these
Answer
Answer: (b) wave.
Question 5.
Earth in turn radiates the heat back to the atmosphere in long waves called
(a) terrestrial radiation
(b) photochemical radiation
(c) heat radiations
(d) ultraviolet radiations
Answer
Answer: (a) terrestrial radiation.
Question 6.
What is the distance between the sun and the earth?
(a) 152 million km.
(b) 1520 million km.
(c) 15200 million km.
(d) 1500 million km.
Answer
Answer: (a) 152 million km.
Question 7.
On what day the earth is nearest to the sun?
(a) 21st June
(b) 23rd December
(c) 3rd January
(d) 21st July
Answer
Answer: (c) 3rd January.
Question 8.
The dark spots appearing on the sun’s surface are called
(a) Sun spots
(b) Aurora australis
(c) Auroralis
(d) none of these
Answer
Answer: (a) Sun spots.
Question 9.
What causes the variations in insolation?
(a) rotation of the earth on its axis
(b) terrestrial radiations
(c) atmospheric gases
(d) none of these
Answer
Answer: (a) rotation of the earth on its axis.
Question 10.
Which factor determines the angle of inclination of solar rays?
(a) altitude
(b) ocean currents
(c) latitude
(d) rotation of’the earth
Answer
Answer: (c) latitude.
Question 11.
On what day the sun is overhead at the Tropic of Cancer?
(a) July 21st
(b) June 21st
(c) January 3rd
(d) March 21st
Answer
Answer: (b) June 21st.
Question 12.
The angle of inclination of sun’s rays at noon at Delhi (28°N):
(a) 85°
(b) 47°
(c) 0°
(d) 57°
Answer
Answer: (a) 85°.
Question 13.
The axis of rotation of Earth is inclined about
(a) 23½°
(b) 66½°
(c) 28°N
(d) none of these
Answer
Answer: (b) 66½°.
Question 14.
When is North pole inclined 23½° toward the sun?
(a) 21st March
(b) 21st June
(c) 23rd September
(d) 23rd March
Answer
Answer: (b) 21st June.
Question 15.
Which processes operate on insolation during the passage through the atmosphere?
(a) absorption
(b) scattering
(c) reflection
(d) all of these
Answer
Answer: (d) all of these.
Question 16.
Through which process the colour of the sky seems blue?
(a) absorption
(b) reflection
(c) scattering
(d) none of these
Answer
Answer: (c) scattering.
Question 17.
The combined reflection from the earth’s surface and clouds is known as
(a) insolation
(b) reflection
(c) albedo
(d) aurora Australis
Answer
Answer: (c) albedo.
Question 18.
The heat transfer by contact is termed as
(a) conduction
(b) convection
(c) radiation
(d) none of these
Answer
Answer: (a) conduction.
Question 19.
The earth transmits the heat by
(a) conduction
(b) convection
(c) radiation
(d) all of these
Answer
Answer: (d) all of these.
Question 20.
By which process the earth’s surface is heated?
(a) convection
(b) conduction
(c) radiation
(d) none of these
Answer
Answer: (b) conduction.
Question 21.
How much solar radiation is received at the top of the atmosphere?
(a) 100 units
(b) 110 units
(c) 47 units
(d) 53 units
Answer
Answer: (a) 100 units.
Question 22.
Which factor controls the temperature distribution?
(a) latitude
(b) altitude
(c) ocean current
(d) all of these
Answer
Answer: (d) All of these.
Question 23.
What is normal lapse rate?
(a) 6.5°C per km.
(b) 65°C per km.
(c) 5.6°C per km.
(d) 6.6°C per km.
Answer
Answer: (a) 6.5°C per km.
Question 24.
What least range of temperature is found between 20°S and 15°N?
(a) 3°C
(b) 5°C
(c) 20°C
(d) 10°C
Answer
Answer: (a) 3°C.
Question 25.
The sun has how many shapes?
(a) Four
(b) Three
(c) Two
(d) Five
Answer
Answer: (b) Three.
II. Fill up the blanks with suitable words
Question 1.
Sun is the ultimate source of energy for the planet …………….
Answer
Answer: earth
Question 2.
On January 3rd, the earth is nearest to sun, 147 million km. This position is called ………………
Answer
Answer: perihelion.
Question 3.
The ……………. and ………….. of insolation day during a day in a season and in a year.
Answer
Answer: amount, intensity
Question 4.
The ……………. determines the angle of inclination of solar rays.
Answer
Answer: latitude
Question 5.
When sun is overhead at noon over the equator these days are called ……………….
Answer
Answer: equinoxes.
Question 6.
The ……………… the duration of daylight the ……………. will be the insolation.
Answer
Answer: longer, larger
Question 7.
The clouds ……………… part of ………………
Answer
Answer: reflect, radiations
Question 8.
The earth transmits the heat through ……………, ………….., …………….
Answer
Answer: conduction, convection, radiation
Question 9.
The atmosphere is largely …………… to short wave solar radiation.
Answer
Answer: transparent
Question 10.
The air and water vapour carries the heat ……………… through the process of …………….
Answer
Answer: upward, convection
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