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

---