NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 119 - 123 of 2142
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Question number: 119
» Kinematics » Scalars and Vectors » Scalar and Vector Products
Question
If for two vectors A and B, A x B = 0, which of the following is not correct?
(1) They are perpendicular to each other
(2) They act at an angle of 60°
(3) They act at an angle of 30°
(4) They are parallel to each other
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 2 and 4 are correct |
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| b. | 1 and 3 are correct |
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| c. | 1 and 2 are correct |
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| d. | 1, 2 and 3 are correct |
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Question number: 120
» Kinematics » Motion in a Straight Line
Question
A particle moves towards east with velocity 5 m/s. After 10 seconds its direction changes towards north with same velocity. The average acceleration of the particle is
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | m/s 2 S-W |
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| b. | m/s 2 N-W |
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| c. | zero |
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| d. | m/s 2 N-E |
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Question number: 121
» Kinematics » Motion in a Straight Line
Question
A 120 m long train is moving towards west with a speed of 10 m/s. A bird flying towards east with a speed of 5 m/s crosses the train. The time taken by the bird to cross the train will be
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 8 sec |
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| b. | 14 sec |
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| c. | 16 sec |
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| d. | 12 sec |
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Question number: 122
» Kinematics » Motion in a Straight Line
Question
P, Q and R are three coplanar forces acting at a point and are in equilibrium. Given P = 1.9318 kg wt, sin Q = 0.9659, the value of R is (in kg wt)
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 2 |
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| b. | 1 |
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| c. | 0.9659 |
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| d. | 0.5 |
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Question number: 123
» Kinematics » Scalars and Vectors » Scalar and Vector Products
Assertion (Ꭺ)
The sum of two vectors can be zero.
Reason (Ꭱ)
Two vectors cancel each other, when they are equal and opposite.
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Ꭺ is false but Ꭱ is true |
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| b. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ |
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| c. | Ꭺ is true but Ꭱ is false |
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| d. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ |
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