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Question 11 Mark

Fill in the blanks. _____ is the term used for negative acceleration.

Answer

Retardation is the term used for negative acceleration.
Explanation: If the velocity of an object is decreasing, it is said to have negative acceleration.

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Question 21 Mark

Fill in the blanks with suitable words:
A motorcycle has a steady _________ of $3m/s^2$. This means that every __________ its _________ increases by __________.

Answer

A motorcycle has a steady $\underline{acceleration}$ of $3 \mathrm{~m} / \mathrm{s}^2$. This means that every $\underline{second }$ its $\underline{velocity }$. increases by $\underline{\mathbf{3 m} / \mathrm{s}}$.

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Question 31 Mark

Fill in the following blanks with suitable words: If a body moves with uniform velocity, its acceleration is ________.

Answer

If a body moves with uniform velocity, its acceleration is zero.

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Question 41 Mark

Fill in the blanks. A bus starting from rest attains a velocity of $54km/h$ in $60s$, its acceleration is _____.

Answer

A bus starting from rest attains a velocity of $54\ km/h$ in $60\ s$, its acceleration is $0.25m/s^2.$
Explanation: initial velocity $= 0$ Time $= 60$$secs$ final velocity $= 54\ km/hr$ $=\frac{54\times1000}{30\times60}\text{m/s}=15\text{m/s}$
$\text{Acceleration}=\frac{\text{Change in velocity}}{\text{times taken}}$
$=\frac{\text{final velocity(v)-intial veclocity(u)}}{\text{time taken(t)}}$
$=\frac{15\frac{\text{m}}{\text{s}}-0}{60\text{secs}}=0.25\text{m/s}^{2}$

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Question 51 Mark

Fill in the following blanks with suitable words: The slope of a speed-time graph of a moving body gives its ________.

Answer

The slope of a speed-time graph of a moving body gives its acceleration.

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Question 61 Mark

Acceleration is calculated from $v - t$ graph while is area under $v - t$ graph.

Answer

Acceleration is calculated from $v - t$ graph while Displacement is area under $v - t$ graph.
Explanation:
The area under a velocity-time graph is a representation of the displacement. If the area is over a time interval, then the displacement during that time interval can be measured by the area under the graph bounded by the time interval.
Bonus: the slope of a $V - t$ graph is a measure of acceleration.

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Question 71 Mark

Fill in the blanks with suitable words:
Acceleration is the rate of change of __________ It is measured in ___________.

Answer

Acceleration is the rate of change of $\underline{velocity}$. It is measured in $\underline {\mathrm{m} / \mathrm{s}^2}$.

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Question 81 Mark

Fill in the following blanks with suitable words: The slope of a distance-time graph indicates ______ of a moving body.

Answer

The slope of a distance-time graph indicates speed of a moving body.

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Question 91 Mark

Fill in the blanks with suitable words: The physical quantity which gives both, the speed and direction of motion of a body is called its __________.

Answer

The physical quantity which gives both, the speed and direction of motion of a body is called its velocity.

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Question 101 Mark

Fill in the blanks with suitable words: Displacement is a _________ quantity whereas distance is a _________ quantity.

Answer

Displacement is a vector quantity whereas distance is a scalar quantity.

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Question 111 Mark

Fill in the blanks with suitable words: Velocity is the rate of change of __________ It is measured in __________.

Answer

Velocity is the rate of change of displacement It is measured in m/s.

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Question 121 Mark

Fill in the following blanks with suitable words: In a speed-time graph, the area enclosed by the speed-time curve and the time axis gives the _____ by the body.

Answer

In a speed-time graph, the area enclosed by the speed-time curve and the time axis gives the distance travelled by the body.

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Question 131 Mark

Angular speed of second hand of a clock is radian per second.

Answer

Angular speed of second hand of a clock is 2 pie radian radian per second.
Explanation:
The angular velocity is independent of the clock size, however for larger clocks the linear velocity of the pointers at the end of the hands will be greater. The second hand goes through $2\pi$ radians in $1$min, or $2\pi$ radian/ $60$ seconds, So, $\omega=\frac{\pi}{30}\text{ rad}.\text{s}^{-1}=0.03\text{ rad.s}^{-1}.$

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Question 141 Mark

When $v - t$ graph has negative slopes acceleration is .

Answer

When $v - t$ graph has negative slopes acceleration is Zero.
Explanation:
If the acceleration is zero, then the slope is zero (i.e., a horizontal line). If the acceleration is positive, then the slope is positive (i.e., an upward sloping line). If the acceleration is negative, then the slope is negative.

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Question 151 Mark

Fill in the following blanks with suitable words: It is possible for something to accelerate but not change its speed if it moves in a ______.

Answer

It is possible for something to accelerate but not change its speed if it moves in a circular path.

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Question 161 Mark

Distance and speed are quantities.

Answer

Distance and speed are Scalar quantities.Explanation:
Scalar quantities are speed, time, distance.

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Question 171 Mark

When v - t graph has negative slopes acceleration is .

Answer

When v - t graph has negative slopes acceleration is Zero.

Explanation:

If the acceleration is zero, then the slope is zero (i.e., a horizontal line). If the acceleration is positive, then the slope is positive (i.e., an upward sloping line). If the acceleration is negative, then the slope is negative.

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Question 181 Mark

Fill in the following blanks with suitable words:
The slope of a speed-time graph of a moving body gives its ________.

Answer

The slope of a speed-time graph of a moving body gives its acceleration.

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Question 191 Mark

Fill in the following blanks with suitable words:
The slope of a distance-time graph indicates ______ of a moving body.

Answer

The slope of a distance-time graph indicates speed of a moving body.

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Question 201 Mark

Fill in the following blanks with suitable words:
It is possible for something to accelerate but not change its speed if it moves in a ______.

Answer

It is possible for something to accelerate but not change its speed if it moves in a circular path.

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Question 211 Mark

Fill in the following blanks with suitable words:
In a speed-time graph, the area enclosed by the speed-time curve and the time axis gives the _____ by the body.

Answer

In a speed-time graph, the area enclosed by the speed-time curve and the time axis gives the distance travelled by the body.

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Question 221 Mark

Fill in the following blanks with suitable words:
If a body moves with uniform velocity, its acceleration is ________.

Answer

If a body moves with uniform velocity, its acceleration is zero.

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Question 231 Mark

Fill in the blanks with suitable words:
Velocity is the rate of change of __________ It is measured in __________.

Answer

Velocity is the rate of change of displacement It is measured in m/s.

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Question 241 Mark

Fill in the blanks with suitable words:
The physical quantity which gives both, the speed and direction of motion of a body is called its __________.

Answer

The physical quantity which gives both, the speed and direction of motion of a body is called its velocity.

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Question 251 Mark

Fill in the blanks with suitable words:
Displacement is a _________ quantity whereas distance is a _________ quantity.

Answer

Displacement is a vector quantity whereas distance is a scalar quantity.

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Question 261 Mark

Fill in the blanks with suitable words:
A motorcycle has a steady _________ of 3m/s². This means that every __________ its _________ increases by __________.

Answer

A motorcycle has a steady acceleration of 3m/s². This means that every second its velocity increases by 3m/s.

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Question 271 Mark

Fill in the blanks with suitable words:
Acceleration is the rate of change of __________ It is measured in ___________.

Answer

Acceleration is the rate of change of velocity It is measured in m/s².

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Question 281 Mark

Fill in the blanks.
_____ is the term used for negative acceleration.

Answer

Retardation is the term used for negative acceleration.
Explanation:
If the velocity of an object is decreasing, it is said to have negative acceleration.

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Question 291 Mark

Fill in the blanks.
A bus starting from rest attains a velocity of 54km/h in 60s, its acceleration is _____.

Answer

A bus starting from rest attains a velocity of 54 km/h in 60 s, its acceleration is 0.25m/s².
Explanation:
initial velocity = 0
Time = 60secs
final velocity = 54km/hr
$=\frac{54\times1000}{30\times60}\text{m/s}=15\text{m/s}$
$\text{Acceleration}=\frac{\text{Change in velocity}}{\text{times taken}}$
$=\frac{\text{final velocity(v)-intial veclocity(u)}}{\text{time taken(t)}}$
$=\frac{15\frac{\text{m}}{\text{s}}-0}{60\text{secs}}=0.25\text{m/s}^{2}$

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Question 301 Mark

Distance and speed are quantities.

Answer

Distance and speed are Scalar quantities.

Explanation:

Scalar quantities are speed, time, distance.

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Question 311 Mark

Angular speed of second hand of a clock is radian per second.

Answer

Angular speed of second hand of a clock is 2 pie radian radian per second.

Explanation:

The angular velocity is independent of the clock size, however for larger clocks the linear velocity of the pointers at the end of the hands will be greater. The second hand goes through $2\pi$ radians in 1min, or $2\pi$ radian/ 60 seconds,

So, $\omega=\frac{\pi}{30}\text{ rad}.\text{s}^{-1}=0.03\text{ rad.s}^{-1}.$

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Question 321 Mark

Acceleration is calculated from v - t graph while is area under v - t graph.

Answer

Acceleration is calculated from v - t graph while Displacement is area under v - t graph.

Explanation:

The area under a velocity-time graph is a representation of the displacement. If the area is over a time interval, then the displacement during that time interval can be measured by the area under the graph bounded by the time interval.

Bonus: the slope of a V - t graph is a measure of acceleration.

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