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44 questions
11
Wave motion
Moderate
+1.0
-0.25
Assertion (A): Radio waves bend in a magnetic field. Reason (R): Radio waves are electromagnetic in nature.
12
Wave motion
Moderate
+1.0
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Cosmic rays—
13
Wave motion
Moderate
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Which one of the following statements is not true about cosmic rays?
14
Wave motion
Moderate
+1.0
-0.25
Which of the following does not require a medium?
15
Wave motion
Moderate
+1.0
-0.25
Which one of the following is associated with 'Albedo'?
16
Wave motion
Moderate
+1.0
-0.25
The Earth's atmosphere is mainly heated by which one of the following?
17
Wave motion
Moderate
+1.0
-0.25
The atmosphere is mainly heated by the :
18
Wave motion
Moderate
+1.0
-0.25
Consider the following statements and choose the right options given below. (1) Earth's surface re-emits heat in the form of Ultraviolet radiation. (2) Clouds and gases reflect about one fourth of the incoming solar radiation.
19
Wave motion
Moderate
+1.0
-0.25
What is the distance between two successive crests or successive troughs called?
20
Wave motion
Moderate
+1.0
-0.25
The velocity of electromagnetic waves is :