Question

please Answer all these questions in 10 min please


Q1. When the distance travelled by a body is directly proportional to the square of the time taken,the motion of the body is
(a) Uniform
(b) uniformly acceleration
(c ) zig-zag
(d) circula
Q2.A body covers half the distance with a speed of 20 m/s and the other half with a speed of 30 m/s. The average speed of whole journey is
(a) 25 m/s
(b) 24 m/s
(c ) 2.4 m/s
(d) zero
Q3. The numerical ratio of displacement to distance for a moving object is:
(a) Always less than 1
(b) Equal to 1 or less than 1
(c) Always more than 1
(d) Equal to 1 or more than one
Q4. A car is travelling at a speed of 90 km/h. Brakes are applied so as to produce a uniform acceleration of – 0.5 m/s2. Find how far the car will go before it is brought to rest?
(a) 8100 m
(b) 900 m
(c) 625 m
(d) 620 m
Figure for Q5.

Q5. The speed - time graph of a car is given here. Using the data in the graph calculate the total distance covered by the car.
(a) 1250 m
(b) 875 m
(c) 1500 m
(d) 870 m
Figure for Q6.

Q6. From the given v-t graph, it can be inferred that the object is
(a) At rest
(b) In uniform motion
(c) Moving with uniform acceleration
(d) In non-uniform motion
Q7. A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to
(a) Exert large force on the ball
(b) Increases the force exerted by the ball on hands
(c) Increase the rate of change of momentum
(d) Decrease the rate of change of momentum
Fig.for Q8.

Q8.Newton’s third law of motion explains the two forces namely ‘action’ and ‘reaction’ coming into action when the two bodies are in contact with each other. These two forces:
(a) Always act on the same body
(b) Always act on the different bodies in opposite directions
(c) Have same magnitude and direction
(d) Acts on either body at normal to each other
Q9 Which of the following is a measure of inertia?
(a) Velocity of an object
(b) Mass of an object
(c) Volume of an object
(d) All of the above
Q10. The seat belts are provided in the cars so that if the car stops suddenly due to an emergency braking, the persons sitting on the front seats are not thrown forward violently and saved from getting injured. Can you guess the law due to which a person falls in forward direction on the sudden stopping of the car?
(a) Newton’s first law of motion
(b) Newton’s second law of motion
(c) Newton’s third law of motion
(d) Newton’s law of gravitation
Q11.An object of mass 2 kg is sliding with a constant velocity of 4 m/s on a friction less horizontal table. The force required to keep the object moving with the same velocity is:
(a) 32 N
(b) 0 N
(c) 2 N
(d) 8 N
Q12.The unit of measuring the momentum of a moving body is:
(a) m/s
(b) kg.m/s
(c) kg.m/s2
(d) N m2/kg2
Q13.When a balloon held between the hands is pressed, its shape changes. This happens because:
(a) Balanced forces act on the balloon
(b) Unbalanced forces act on the balloon
(c) Frictional forces act on the balloon
(d) Gravitational force acts on the balloon
Q14 A car of mass 1000 kg is moving with a velocity of 10 m/s. If the velocity-time graph for this car is a horizontal line parallel to the time axis, then the velocity of the car at the end of 25 s will be:
(a) 40 m/s
(b) 25 m/s
(c) 10 m/s
(d) 250 m/s
Q15. The numerical ratio of velocity to speed for a moving object is:
(a) Always less than 1
(b) Equal to 1 or less than 1
(c) Always more than 1
(d) Equal to 1 or more than one
Q16.Suppose a boy is enjoying a ride on a marry-go-round which is moving with a constant speed of 10 m/s. It implies that the boy is:
(a) At rest
(b) Moving with no acceleration
(c) In accelerated motion
(d) Moving with uniform velocity
Fig for Q17.

Q17.Four cars A, B, C and D are moving on a levelled, straight road. Their distance time graphs are shown in the figure below. Which of the following is the correct statement regarding the motion of these cars?
(a) Car A is faster than car D
(b) Car B is the slowest
(c) Car D is faster than car C
(d) Car C is the slowest​

Answer 1

Answer:

1.

2.b.24m/s

3.b.equal to 1 or less than 1

4.c.625m

5.b.875m

6.