True False[1 Marks ] - Science STD 7 Questions - Vidyadip

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True False[1 Marks ]

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18 questions · timed · auto-graded

Question 11 Mark

The speed of a train is expressed in m/h.

True
False

Answer

This statement is false

Reason - The speed of a train is measured either in km/h or in m/s.

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Question 21 Mark

The time period of a given pendulum is constant.

True
False

Answer

This statement is false

Reason - Time period of a pendulum depends on the length of the thread. Hence, it is constant for a particular pendulum.

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Question 31 Mark

Distances between two cities are measured in kilometres.

True
False

Answer

This statement is true.

Reason - The distance between two cities can be very large. Since kilometre is a bigger unit of distance, the distance between two cities is measured in kilometres.

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Question 41 Mark

Every object moves with a constant speed.

True
False

Answer

This statment is false.

Explanation: Speed can be defined as the rate of change in distance of the body. For any body which is accelerating in a certain direction the speed of that body is changing at any interval.

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Question 51 Mark

The basic unit of time is second.

True
False

Answer

This statement is true.
Reason - Second is the $SI$ unit of time.

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Question 61 Mark

Periodic events are used for the measurement of time. True/ False

Answer

True.

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Question 71 Mark

The time period of simple pendulum is not constant. True/ False

Answer

True.

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Question 81 Mark

The motion of a spinning top is rotational motion. True/ False

Answer

True.

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Question 91 Mark

The time period of a given pendulum is not constant. True/ False.

Answer

False.

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Question 101 Mark

The smallest time interval that can be measured with commonly available clocks and watches is one second. True/ False

Answer

True.

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Question 111 Mark

$\text{Speed}=\frac{\text{Distance}}{\text{Time}}$ True/ False.

Answer

True.

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Question 121 Mark

The symbols of all units are written in singular. True/ False

Answer

True.

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Question 131 Mark

The basic unit of speed is km/ h. True/ False

Answer

False. Explanation: The basic unit of speed is m/ s.

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Question 141 Mark

For a body in non-uniform motion, the graph is not a straight line. True/ False.

Answer

True.

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Question 151 Mark

The basic unit of time is second. True/ False

Answer

True.

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Question 161 Mark

Faster vehicle has a higher speed. True/ False

Answer

True.

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Question 171 Mark

All the clocks make use of some periodic motion. True/ False

Answer

True.

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Question 181 Mark

The distance-time graph of standing vehicle is a straight line parallel to $x-$axis. True/ False

Answer

True.

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