Science M.C.Q. [1 M]

A student draws a distance-time graph for a moving scooter and finds that a section of the graph is a horizontal line parallel to the time axis. Which of the following conclusion is correct about this section of the graph?

1. The scooter has uniform speed in this section.
2. The distance travelled by scooter is the maximum in this section.
3. The distance travelled by the scooter is the minimum in this section.
4. The distance travelled by the scooter is zero in this section.

A boy is sitting on a merry-go-round which is moving with a constant speed of 10 ms^-1. This means that the boy is:

1. At rest.
2. Moving with no acceleration.
3. In accelerated motion.
4. Moving with uniform velocity.

 A bus increases its speed from 36km/h to 72km/h in 10 seconds. Its acceleration is:

1. 5m/s²
2. 2m/s²
3. 6m/s²
4. 1m/s²

A sprinter is running along the circumference of a big sports stadium with constant speed Which of following do you think is changing in this case?

1. Magnitude of acceleration being produced.
2. Distance covered by the sprinter per second.
3. Direction in which the sprinter is running.
4. Entripetal force acting on the sprit.

When a car driver travelling at a speed of 10m/s applies brakes and brings the car to rest in 20s, then retardation will be:

1. +2m/s²
2. -2m/s²
3. -0.5m/s²
4. +0.5m/s²

In which of the following cases of motion, the distance moved and the magnitude of displacement are equal?

1. If the car is moving on straight road.
2. If the car is moving on circular road.
3. If the pendulum is moving to and fro.
4. If a planet is moving around the sun.

Which one of the following is most likely not a case of uniform circular motion?

1. Motion of the earth around the sun.
2. Motion of a toy train on a circular.
3. Motion of a racing car on a circular tracki.
4. Motion of hours' hand on the dial.

The slope of a speed-time graph gives:

1. Distance travelled.
2. Velocity.
3. Acceleration.
4. Displacement.

50. Which of the following can sometimes be 'zero' for a moving body?

1. Average velocity.
2. Distance travelled.
3. Average speed.
4. Displacement.

1. only (i)
2. (i) and (ii)
3. (i) and (iv)
4. only (iv)

Which of the following could not be a unit of acceleration?

1. km/s²
2. cms^-2
3. km/s
4. m/s²

Which of the following could not be a unit of speed?

1. km/h
2. s/m
3. m/s
4. mm s^-1

he numerical ratio of displacement to distance for a moving object is:

1. Always less than 1
2. Equal to 1 or more than 1
3. Always more than 1
4. Equal to 1 or less than 1

A fielder pulls his hands backwards after catching the cricket ball. This enables the fielder to:

1. Exert larger force on the ball.
2. Reduce the force exerted by the ball.
3. Increase the rate of change of momentum.
4. Keep the ball in hands firmly.

A car of mass 1000kg is moving with a velocity of 10ms^-1. If the velocity-time graph for this car is a horizontal line parallel to the time axis, then the velocity of car at the end of 25s will be:

1. 25ms^-1
2. 40ms^-1
3. 10ms^-1
4. 250ms^-1

If the displacement of an object is proportional to the square of time, then the object is moving with:

1. Uniform velocity.
2. Uniform acceleration.
3. Increasing acceleration.
4. Decreasing acceleration.

One of the following is not a vector quantity. This one is:

1. Displacement.
2. Speed.
3. Acceleration.
4. Velocity.

The speed of a moving object is determined to be 0.06m/s. This speed is equal to:

1. 2.16km/h
2. 1.08km/h
3. 0.216km/h
4. 0.0216km/h 

Which of the following statement is correct regarding velocity and speed of a moving body?

1. Velocity of a moving body is always higher than its speed.
2. Speed of a moving body is always higher than its velocity.
3. Speed of a moving body is its velocity in a given direction.
4. Velocity of a moving body is its speed in a given direction.

42. A bus moving along a straight line at 20m/s undergoes an acceleration of 4m/s². After 2 seconds, its speed will be:

1. 8m/s
2. 12m/s
3. 16m/s
4. 28m/s

A freely falling object travels 4.9m in 1st second, 14.7m in 2nd second, 24.5m in 3rd second, and so on. This data shows that the motion of a freely falling object is a case of:

1. Uniform motion.
2. Uniform acceleration.
3. No acceleration.
4. Uniform velocity.

The area under a speed-time graph represents a physical quantity which has the unit of:

1. m
2. m²
3. ms^-1
4. ms^-2

A motorcycle is being driven at a speed of 20m/s when brakes are applied to bring it to rest five seconds. The deceleration produced in this case will be:

1. +4m/s²
2. -4m/s²
3. +0.25m/s²
4. -0.25m/s²

When a car runs on a circular track with a uniform speed, its velocity is said to be changing. This is because:

1. The car has a uniform acceleration.
2. The direction of car varies continuously.
3. The car travels unequal distances in equal time intervals.
4. The car travels equal distances in unequal time intervals.