CHOSSE THE BEST ANSWERS:
1. A worker covers a distance of 40km from his house to his place of work and 10km towards his
house back. Then the displacement covered by the worker in the whole trip is
a. zero km
b. 10 km
c. 30 km
d. 50 km
2. Rate of change of displacement is called
a. speed
b. deceleration
c. acceleration
d. velocity
3. A player moves along the boundary of a square ground of side 50 m in 200 sec. The magnitude of
displacement of the farmer at the end of 11 minutes 40 seconds from his initial position is
a. 50 m
b. 150 m
c. 200 m
d. 50√2
4. Acceleration is a vector quantity, which indicates that its value
a. is always negative
b. is always positive
c. is zero
d. can be positive,, negative or zero
5. An object travels 40m in 5 sec and then another 80 m in 5 sec. What is the average speed of the
object?
a. 12 m/s
b. 6 m/s
c. 2 m/s
d. 0 m/s
6. Distance covered by the body during the interval from 10 sec to 20 sec
a. 180
b. 200
c. 240
d. 270
7. From the above velocity-time graph, the body is moving with
a. variable acceleration
b. zero acceleration
c. constant acceleration
d. zero velocity
8. What does the slope of distance – time graph give?
a. acceleration
b. uniform speed
c. speed
d. both b and c depending upon the time of graph
9. In the total journey, starting from the rest the body has traveled up to a distance of
a. 270 m
b. 360 m
c. 450 m
d. 540 m
10. The velocity of the body at the point ‘B’ is
a. 20 m/s
b. 24 m/s
c. 32 m/s
d. 36 m/s
II). FILL IN THE BLANKS:
1. Displacement is a ______ quantity, where as distance is a ___________ quantity
2. The physical quantity that includes both the speed and direction of the motion of a body is called its_______________.
3. A motorcycle has a steady __________of 3 m/ . This means that each___________ its _________ increases by __________
4. Acceleration is the rate of change of ________. It is measured in____________
5. Velocity is the rate of change of ____________. It is measured in__________
III ) ANSWER THE FOLLOWING QUESTIONS:
1. Give an example when we infer the motion indirectly?
2. If the displacement of a body is zero is it necessary that the distance covered by is is also zero?
3. A scooter travelling at 10 m/s speed up to 20 m/s in 4 sec.Find the acceleration of the scooter.
4. Can an object be at rest as well as in motion at the same time?
5. Differentiate uniform and Non uniform motion.
6. WhatA motorcyclist drives from place A to B with a uniform speed of 30 km and returns from Place B to A with a uniform speed of 20 km . Find his average speed
7. The velocity time graph of two bnodies A and B travelling along the x direction are given in the fig.
a) Are the bodies moving with uniform acceleration?
b) Which body is moving with greater acceleration A (or) B.
. ASSERTION AND REASON
A. If both assertion and reason are true and the reason is the correct explanation of the assertion
B. If both assertion and reason are true but reason is not the correct explanation the assertion
C. If assertion is true but reason is false.
D. If the assertion and reason both are false.
8. 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 same mass of the ball.
9. 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.
10.An object dropped from cliff falls with a constant acceleration of 10m/s2 .Find its speed 5 s after it was dropped.
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Answers
Explanation:
A worker covers a distance of 40km from his house to his place of work and 10km towards his
house back. Then the displacement covered by the worker in the whole trip is
d. 50 km
Therefore, the total distance covered by that worker is,:
40 km from his house to his place of work + 10km towards his house back 40 + 10 = 50 km.
Likewise, the total displacement is 40 - 10 = 30 km
Then the displacement covered by the worker in the whole trip will be 50km
Rate of change of displacement is called
d. velocity
Velocity: It can be defined as the rate of change of displacement of an object is velocity. Velocity has both magnitude ( speed) and direction and is therefore a vector.
A player moves along the boundary of a square ground of side 50 m in 200 sec. The magnitude of
displacement of the farmer at the end of 11 minutes 40 seconds from his initial position is
A player moves along the boundary of a square ground of side 50 m in 200 sec. The magnitude of
displacement of the farmer at the end of 11 minutes 40 seconds from his initial position is
The time taken to travel 200m( perimeter of square is 4*side)=200s. the time taken to travel 1m is 1sec.
the speed of player is 1m/s ∴
The distance travelled is (1*(11*60)+40)=700m ∴ 3.5 rounds of the field so displacement is AC=diagonal of square
According to pythagoras theorem. (AD)²+(DC)²=(AC)².
So AC=(2500+2500)^1/2. AC=50√2
d. 50√2