Q. No.From the following displacement-time graph , find out the velocity of a moving body.
1. m/s
2. 3 m/s
3. m/s
4. m/s
The v – t plot of a moving object is shown in the figure. The average velocity of the object during the first 10 seconds is
(1) 0
(2) 2.5 ms–1
(3) 5 ms–1
(4) 2 ms–1
Read the assertion and reason carefully to mark the correct option out of the options given below:
(1) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(2) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(3) If assertion is true but reason is false.
(4) If the assertion and reason both are false.
(5) If assertion is false but reason is true.
Assertion : A body can have acceleration even if its velocity is zero at a given instant of time.
Reason : A body is momentarily at rest when it reverses its direction of motion.
Read the assertion and reason carefully to mark the correct option out of the options given below:
(1) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(2) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(3) If assertion is true but reason is false.
(4) If the assertion and reason both are false.
(5) If assertion is false but reason is true.
Assertion : Two balls of different masses are thrown vertically upward with same speed. They will pass through their point of projection in the downward direction with the same speed.
Reason : The maximum height and downward velocity attained at the point of projection are independent of the mass of the ball.
Read the assertion and reason carefully to mark the correct option out of the options given below:
(1) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(2) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(3) If assertion is true but reason is false.
(4) If the assertion and reason both are false.
(5) If assertion is false but reason is true.
Assertion : The average velocity of the object over an interval of time is either smaller than or equal to the average speed of the object over the same interval.
Reason : Velocity is a vector quantity and speed is a scalar quantity.
Read the assertion and reason carefully to mark the correct option out of the options given below:
(1) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(2) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(3) If assertion is true but reason is false.
(4) If the assertion and reason both are false.
(5) If assertion is false but reason is true.
Assertion : An object can have constant speed but variable velocity.
Reason : Speed is a scalar but velocity is a vector quantity.
Read the assertion and reason carefully to mark the correct option out of the options given below:
(1) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(2) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(3) If assertion is true but reason is false.
(4) If the assertion and reason both are false.
(5) If assertion is false but reason is true.
Assertion : The speed of a body can be negative.
Reason : If the body is moving in the opposite direction of positive motion, then its speed is negative.
| Assertion (A): | The position-time graph of a uniform motion in one dimension of a body can have negative slope. |
| Reason (R): | When the speed of body decreases with time, the position-time graph of the moving body has negative slope. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
| Assertion (A): | A positive acceleration of a body can be associated with a ‘slowing down’ of the body. |
| Reason (R): | Acceleration is a vector quantity. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Read the assertion and reason carefully to mark the correct option out of the options given below:
(1) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(2) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(3) If assertion is true but reason is false.
(4) If the assertion and reason both are false.
(5) If assertion is false but reason is true.
Assertion : The average speed of a body over a given interval of time is equal to the average velocity of the body in the same interval of time if a body moves in a straight line in one direction.
Reason : Because in this case distance travelled by a body is equal to the displacement of the body.
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