91. What is the characteristic of planetary winds

1. 1. These flow from the belts of high pressure to the belts of low pressure

   
   
   

   2. These flow from the belts of low pressure to the belt of high pressure

   
   
   

   3. These do not flow to any centre of pressure

   
   
   

   4. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---

92. Arrange the constituent gases of the atmosphere in descending order of their percentage to the total composition of the atmosphere.
    1. Nitrogen
    2. Oxygen
    3. Argon
    4. Carbon dioxide
    Code

1. 1. 1-2-4-3

   
   
   

   2. 1-4-2-3

   
   
   

   3. 1-2-3-4

   
   
   

   4. 1-4-3-2

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---

---

93. Which of the following pair is wrongly matched

1. 1. Mesosphere - Extends out to about 100 km

   
   
   

   2. Thermosphere - Extends out to about 400 km

   
   
   

   3. Exosphere - Extends beyond the Thermosphere hundreds of kilometers

   
   
   

   4. Stratosphere - Extends out to about 500 km

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

---

94. Assertion (A) : The warmer portions of the water are less dense and therefore, they rise.
    Reason (R): The cooler portions of the water fall because they are denser.

1. 1. If (A) and (R) are correct and (R) is the correct explanation of (A)

   
   
   

   2. If (A) and (R) are correct but (R) is not the correct explanation of (A)

   
   
   

   3. If (A) is true but (R) is false

   
   
   

   4. If (A) is false but (R) is true

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

---

---

95. A layer in the Earth s atmosphere called Ionosphere facilitates radio communication Why ?
    1. The presence of ozone 'causes the, reflection of radio waves to Earth.
    2. Radio waves have a very long wavelength.
    Which of the statements given above is / are correct

1. 1. 1 only

   
   
   

   2. 2 only

   
   
   

   3. Both 1 and 2

   
   
   

   4. Neither 1 nor 2

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

---