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PHXI03:MOTION IN A STRAIGHT LINE

362235 Which of the following can be zero, when a particle is in motion for sometime?

1 Speed

2 Displacement

3 Distance

4 None of these

PHXI03:MOTION IN A STRAIGHT LINE

362236 An athlete completes one round of a circular track of radius R in 40 sec. What will be his displacement at the end of 3 min?

1 Zero

2

2 R

3

2 π R

4

7 π R

Explanation:

The body completes for and half rotations and hence the displacement is equal $2 R$ (shortest distance between the initial and final position)

PHXI03:MOTION IN A STRAIGHT LINE

362237 An insect crawls a distance of $4 m$ along north in $10 s$ and then a distance of $3 m$ along east in $5 s$ . The average velocity of the insect is

1

\frac{7}{15} m / s

2

\frac{1}{5} m / s

3

\frac{1}{3} m / s

4

\frac{4}{5} m / s

Explanation:

$v_{a v} = \frac{D i s p l a c e m e n t}{T i m e}$
$= \frac{\sqrt{{(4)}^{2} + {(3)}^{2}}}{10 + 5} = \frac{1}{3} m / s$

PHXI03:MOTION IN A STRAIGHT LINE

362238 Assertion :
Position-time graph of a stationary object is a straight line parallel to time axis.
Reason :
For a stationary object, position does not change with time.

1 Both assertion and reason are correct and reason is the correct explanation of assertion.

2 Both assertion and reason are correct but reason is not the correct explanation of assertion.

3 Assertion is correct but reason is incorrect.

4 Assertion is incorrect but reason is correct.

PHXI03:MOTION IN A STRAIGHT LINE

362235 Which of the following can be zero, when a particle is in motion for sometime?

1 Speed

2 Displacement

3 Distance

4 None of these

PHXI03:MOTION IN A STRAIGHT LINE

362236 An athlete completes one round of a circular track of radius R in 40 sec. What will be his displacement at the end of 3 min?

1 Zero

2

2 R

3

2 π R

4

7 π R

Explanation:

The body completes for and half rotations and hence the displacement is equal $2 R$ (shortest distance between the initial and final position)

PHXI03:MOTION IN A STRAIGHT LINE

362237 An insect crawls a distance of $4 m$ along north in $10 s$ and then a distance of $3 m$ along east in $5 s$ . The average velocity of the insect is

1

\frac{7}{15} m / s

2

\frac{1}{5} m / s

3

\frac{1}{3} m / s

4

\frac{4}{5} m / s

Explanation:

$v_{a v} = \frac{D i s p l a c e m e n t}{T i m e}$
$= \frac{\sqrt{{(4)}^{2} + {(3)}^{2}}}{10 + 5} = \frac{1}{3} m / s$

PHXI03:MOTION IN A STRAIGHT LINE

362238 Assertion :
Position-time graph of a stationary object is a straight line parallel to time axis.
Reason :
For a stationary object, position does not change with time.

1 Both assertion and reason are correct and reason is the correct explanation of assertion.

2 Both assertion and reason are correct but reason is not the correct explanation of assertion.

3 Assertion is correct but reason is incorrect.

4 Assertion is incorrect but reason is correct.

PHXI03:MOTION IN A STRAIGHT LINE

362235 Which of the following can be zero, when a particle is in motion for sometime?

1 Speed

2 Displacement

3 Distance

4 None of these

PHXI03:MOTION IN A STRAIGHT LINE

362236 An athlete completes one round of a circular track of radius R in 40 sec. What will be his displacement at the end of 3 min?

1 Zero

2

2 R

3

2 π R

4

7 π R

Explanation:

The body completes for and half rotations and hence the displacement is equal $2 R$ (shortest distance between the initial and final position)

PHXI03:MOTION IN A STRAIGHT LINE

362237 An insect crawls a distance of $4 m$ along north in $10 s$ and then a distance of $3 m$ along east in $5 s$ . The average velocity of the insect is

1

\frac{7}{15} m / s

2

\frac{1}{5} m / s

3

\frac{1}{3} m / s

4

\frac{4}{5} m / s

Explanation:

$v_{a v} = \frac{D i s p l a c e m e n t}{T i m e}$
$= \frac{\sqrt{{(4)}^{2} + {(3)}^{2}}}{10 + 5} = \frac{1}{3} m / s$

PHXI03:MOTION IN A STRAIGHT LINE

362238 Assertion :
Position-time graph of a stationary object is a straight line parallel to time axis.
Reason :
For a stationary object, position does not change with time.

1 Both assertion and reason are correct and reason is the correct explanation of assertion.

2 Both assertion and reason are correct but reason is not the correct explanation of assertion.

3 Assertion is correct but reason is incorrect.

4 Assertion is incorrect but reason is correct.

PHXI03:MOTION IN A STRAIGHT LINE

362235 Which of the following can be zero, when a particle is in motion for sometime?

1 Speed

2 Displacement

3 Distance

4 None of these

PHXI03:MOTION IN A STRAIGHT LINE

362236 An athlete completes one round of a circular track of radius R in 40 sec. What will be his displacement at the end of 3 min?

1 Zero

2

2 R

3

2 π R

4

7 π R

Explanation:

The body completes for and half rotations and hence the displacement is equal $2 R$ (shortest distance between the initial and final position)

PHXI03:MOTION IN A STRAIGHT LINE

362237 An insect crawls a distance of $4 m$ along north in $10 s$ and then a distance of $3 m$ along east in $5 s$ . The average velocity of the insect is

1

\frac{7}{15} m / s

2

\frac{1}{5} m / s

3

\frac{1}{3} m / s

4

\frac{4}{5} m / s

Explanation:

$v_{a v} = \frac{D i s p l a c e m e n t}{T i m e}$
$= \frac{\sqrt{{(4)}^{2} + {(3)}^{2}}}{10 + 5} = \frac{1}{3} m / s$

PHXI03:MOTION IN A STRAIGHT LINE

362238 Assertion :
Position-time graph of a stationary object is a straight line parallel to time axis.
Reason :
For a stationary object, position does not change with time.

1 Both assertion and reason are correct and reason is the correct explanation of assertion.

2 Both assertion and reason are correct but reason is not the correct explanation of assertion.

3 Assertion is correct but reason is incorrect.

4 Assertion is incorrect but reason is correct.