Important Questions Test: Motion & Time

# Important Questions Test: Motion & Time

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## 20 Questions MCQ Test Science Class 7 | Important Questions Test: Motion & Time

Important Questions Test: Motion & Time for Class 7 2022 is part of Science Class 7 preparation. The Important Questions Test: Motion & Time questions and answers have been prepared according to the Class 7 exam syllabus.The Important Questions Test: Motion & Time MCQs are made for Class 7 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions Test: Motion & Time below.
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Important Questions Test: Motion & Time - Question 1

### A body covers half of its journey with a speed of 60 m/s and the other half with a speed of 40 m/s. Then average speed during whole journey is

Detailed Solution for Important Questions Test: Motion & Time - Question 1

Average speed of body = where V= 60 m/s

V= 40 m/s

Average speed = 2 * 60 *40 / 100

= 4800/100

= 48 m/s

Important Questions Test: Motion & Time - Question 2

### The rate of change of displacement with time is called

Detailed Solution for Important Questions Test: Motion & Time - Question 2

Velocity is the rate of motion, speed or action. An example of velocity is a car driving at 75 miles per hour.

Important Questions Test: Motion & Time - Question 3

### Which of the following is the basic unit of speed?

Detailed Solution for Important Questions Test: Motion & Time - Question 3

Speed is the distance traveled per unit of time.It is denoted as m/s.

Important Questions Test: Motion & Time - Question 4

A micro-second is equal to

Detailed Solution for Important Questions Test: Motion & Time - Question 4

A microsecond is an SI unit of time equal to one millionth (0.000001 or 10−6 or ​1⁄1,000,000) of a second.

Important Questions Test: Motion & Time - Question 5

If a pendulum is vibrating at 10 Cycles−1, its time period is

Detailed Solution for Important Questions Test: Motion & Time - Question 5

Time period = time for one complete

oscillation=1/10 sec=0.1second

Important Questions Test: Motion & Time - Question 6

Physical quantity which we can't obtain from a distance- time graph is

Detailed Solution for Important Questions Test: Motion & Time - Question 6

A distance-time graph shows how far an object has travelled in a given time. Distance is plotted on the Y-axis (left) and Time is plotted on the X-axis.

Important Questions Test: Motion & Time - Question 7

A body has an acceleration of4ms−2. What is its retardation?

Detailed Solution for Important Questions Test: Motion & Time - Question 7

Retardation means negative acceleration.

Important Questions Test: Motion & Time - Question 8

If the velocity of a body does not change with time, its acceleration is

Detailed Solution for Important Questions Test: Motion & Time - Question 8

Velocity is the rate of change of position with respect to time, whereas acceleration is the rate of change of velocity.If velocity does not change then the acceleration would be zero.

Important Questions Test: Motion & Time - Question 9

All of the following is a unit of speed except

Detailed Solution for Important Questions Test: Motion & Time - Question 9

Pounds per square inch or p.s.i. is the unit of pressure. Pound is the unit weight and square inch is that of area. Therefore, p.s.i. cannot be the unit of speed.

Important Questions Test: Motion & Time - Question 10

Which of the following does not show oscillatory motion?

Detailed Solution for Important Questions Test: Motion & Time - Question 10

A fan shows circular motion.

Important Questions Test: Motion & Time - Question 11

Which of the following statement(s) is/are correct?

Detailed Solution for Important Questions Test: Motion & Time - Question 11

Symbols of all units are written in singular

Important Questions Test: Motion & Time - Question 12

It is a part of wall clock and performs oscillatory motion. Its time period is fixed. It is

Detailed Solution for Important Questions Test: Motion & Time - Question 12

Pendulums are used to regulate the movement of clocks because the interval of time for each complete oscillation, called the period, is constant.

Important Questions Test: Motion & Time - Question 13

A body moving in a straight line is said to be in uniform motion, if

Detailed Solution for Important Questions Test: Motion & Time - Question 13

It covers equal distances in equal intervals of time, how so ever small the interval may be

Important Questions Test: Motion & Time - Question 14

Why is the average speed of a moving object same as the actual speed of the moving object in case of uniform motion in a straight line?

Detailed Solution for Important Questions Test: Motion & Time - Question 14

Uniform motion is the motion when the object travels in a straight line and its velocity remains constant along that line as it covers equal distances in equal intervals of time.

Important Questions Test: Motion & Time - Question 15

A graph is plotted showing the velocity of a car as a function of time. If the graph is a straight line, it means that

Detailed Solution for Important Questions Test: Motion & Time - Question 15

If velocity isn't changing with time,then there is motion in the body with a constant velocity in a fixed direction but acceleration is Zero.

Important Questions Test: Motion & Time - Question 16

The acceleration of a car that speeds up from 12 meters per second to 30 meters per second in 15 seconds is

Detailed Solution for Important Questions Test: Motion & Time - Question 16

Acceleration = 30-12/15
=18/15
=1.2m/s

Important Questions Test: Motion & Time - Question 17

A velocity-time graph gives (i) the distance (ii) the displacement (iii) the acceleration (iv) the speed

Detailed Solution for Important Questions Test: Motion & Time - Question 17

A velocity-time graph shows changes in velocity of a moving object over time. The slope of a velocity-time graph represents acceleration of the moving object.

Important Questions Test: Motion & Time - Question 18

Displacement is the

Detailed Solution for Important Questions Test: Motion & Time - Question 18

Displacement is the shortest distance between initial and final positions.

Important Questions Test: Motion & Time - Question 19

An object has travelled 10 km in 15 minutes, its displacement will be

Detailed Solution for Important Questions Test: Motion & Time - Question 19

An object has traveled 10 km in 15 minutes; its displacement will be according to the direction it has followed.

Important Questions Test: Motion & Time - Question 20

If an object covers equal distances in equal intervals of time, it is said to be in

Detailed Solution for Important Questions Test: Motion & Time - Question 20

If an object covers equal distances in equal intervals of time, it is said to be in uniform motion.

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## Science Class 7

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