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AIIMS (All India Institute of Medical Sciences) Physics: Questions 219 - 222 of 500
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Question 219
Appeared in Year: 2006
Question MCQ▾
A boat at anchor is rocked by waves whose crests are 100m apart and velocity is . The boat bounces up once in every –
Choices
Choice (4) | Response | |
---|---|---|
a. | 0.25 s | |
b. | 2500 s | |
c. | 75 s | |
d. | 4 s |
Question 220
Appeared in Year: 2005
Question Assertion-Reason▾
Assertion(Ꭺ)
For Reynold number Re > 2000, the flow of fluid is turbulent.
Reason(Ꭱ)
Inertial forces are dominant compared to the viscous forces at such high Reynold numbers
Choices
Choice (4) | Response | |
---|---|---|
a. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ | |
b. | Ꭺ is false but Ꭱ is true | |
c. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ | |
d. | Both Ꭺ and Ꭱ are false |
Question 221
Appeared in Year: 2005
Question Assertion-Reason▾
Assertion(Ꭺ)
By roughening the surface of a glass sheet its transparency can be reduced.
Reason(Ꭱ)
Glass sheet with rough surface absorbs more light.
Choices
Choice (4) | Response | |
---|---|---|
a. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ | |
b. | Both Ꭺ and Ꭱ are false | |
c. | Ꭺ is true but Ꭱ is false | |
d. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ |
Question 222
Appeared in Year: 2006
Question Assertion-Reason▾
Assertion(Ꭺ)
Electromagnetic waves with frequencies smaller than the critical frequency of ionosphere cannot be used for communication using sky wave propagation.
Reason(Ꭱ)
The refractive index of the ionosphere becomes very high for frequencies higher than the critical frequency.
Choices
Choice (4) | Response | |
---|---|---|
a. | Both Ꭺ and Ꭱ are false | |
b. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ | |
c. | Ꭺ is true but Ꭱ is false | |
d. | Ꭺ is false but Ꭱ is true |