Distance and Displacement

Q.

A racing car has a uniform acceleration of $4\raisebox{1ex}{$m$}\!\left/ \!\raisebox{-1ex}{$s^2$}\right.$. What distance will it cover in $10sec$ after the start?

Q.

What causes friction between two surfaces in contact when they try to slide past each other?

1. Interlocking of irregularities present on the surfaces

2. Gravitational attraction between the surfaces

3. Rigidity of the surfaces

4. Presence of atmosphere around the surfaces

Q.

An athlete runs along a circular track of diameter $28m.$ The displacement of the athlete after he completes one circle is.

1. $28m$

2. $88m$

3. $44m$

4. Zero

Q.

Ramu moves along the periphery of a square field of side $10m$. He completes travelling one side in $40s$. What will be the magnitude of distance and displacement at the end of $2$ minutes and $20$ seconds ?

1. $35m$, $35m$

2. $35m$, $5m$

3. $25m$, $10m$

4. $35m$, $10m$

Q. John throws four stones having same weight on four different surfaces such as icy, dry, sandy and cemented. He throws each stone with the same force. On which among the following surfaces will the stone go maximum distance before it comes to rest?

1. Dry surface
2. Icy surface
3. Sandy surface
4. Cemented surface

Q.

Which of the following is a lubricant?

1. Rubber

2. Sand

3. Salt

4. Grease

Q.

Which of the following methods will help in reducing air drag?

1. Polishing

2. Using lubricants

3. Streamlining

4. Using ball bearings

Q.

Consider the following statements:

Statement 1: Rough surfaces generally have more friction between them.
Statement 2: When we attempt to slide one surface over another, we have to apply a force to overcome interlocking between the irregularities present on the surfaces.

Choose the correct option.

1. Statement 1 is incorrect but statement 2 is correct.

2. Both the statements are incorrect.

3. Statement 1 is correct but statement 2 is incorrect.

4. Both the statements are correct.

Q.

Friction wears out the __________ parts of a machine. (moving / static)

Q. The velocity of a car increases from $20m{s}^{-1}$ to $40m{s}^{-1}$ in $5s$. Calculate the acceleration.

1. 4

Q.

What do you mean by displacement?

Q. An ant takes $5s$ to complete one round trip along a circular path. How much time will it take for the ant to travel along the diameter of the circle and come back? Assume that the speed of the ant is constant throughout the process.

1. $10s$
2. $\frac{\pi }{10}s$
3. $\frac{10}{\pi }s$
4. $\frac{5}{\pi }s$

Q.

If a book placed on a horizontal desk is pushed towards right, what will be the direction of frictional force acting on it?

1. Towards right

2. Vertically upwards

3. Vertically downwards

4. Towards left

Q. A sofa remains stationary even after applying a horizontal force. This means that frictional force is ____________ applied force.

1. lesser than
2. greater than
3. equal to
4. either greater than or equal to

Q. An ant takes $5s$ to complete one round trip along a circular path. How much time will it take for the ant to travel along the diameter of the circle and come back? Assume that the speed of the ant is constant throughout the process.

1. $\frac{10}{\pi }s$
2. $\frac{\pi }{10}s$
3. $10s$
4. $\frac{5}{\pi }s$

Q.

Why is displacement referred to as a vector quantity?

Q. A boy moves along a circular path of perimeter $30m$ and comes back to the point where he started the journey. What is the distance covered and the displacement of the boy?

1. Distance = $30m$
   Displacement = $30m$
2. Distance = $0m$
   Displacement = $30m$
3. Distance = $30m$
   Displacement = $0m$
4. Distance = $0m$
   Displacement = $0m$

Q.

Give one example when displacement is zero while the distance is not-zero ?

Q. A man is sitting inside a moving train and observes the objects outside of the train. Then choose the single correct choice from the following statements

1. Stationary objects near the train will move with grater velocity & object far from train will move with lesser velocity with respect to the man
2. large objects like moon or mountains will move with same velocity as that of the train
3. all stationary objects outside the train will move with same velocity in opposite direction of the train with respect to the man.
4. all of these.

Q.

Which all of the following are true about liquid pressure?

1. Pressure is the same in all directions about a point inside the liquid.

2. In a stationary liquid, the pressure is same at all points on a horizontal plane.

3. Inside the liquid, pressure increases with the increase in depth from its free surface.

4. A liquid can not exert pressure

Q.

If you are dropped on large friction less surface, how will you come out of it?

Q.

In a large commercial complex, there are four ways to reach the main road. One of the paths has loose soil, the second is laid with polished marble, the third is laid with bricks and the fourth has a gravel surface. It is raining heavily and Paheli wishes to reach the main road. The path on which she is least likely to slip is

1. Loose soil

2. Polished marble

3. Bricks

4. Gravel

Q.

Which of the following statement(s) is/are true for displacement?

1. It can be zero.

2. Its magnitude is greater than the distance travelled by the object.

3. It is a scalar quantity.

4. Its magnitude is less than or equal to the distance travelled by the object.

Q.

A $150m$ long train is moving with a uniform velocity of $45km/hr$. The time taken by the train to cross a bridge of length $850m$ is:

1. 80 s

2. 60 s

3. 40 s

4. 20 s

Q.

A motorboat starting from rest on a lake accelerates in a straight line at a constant rate of $3.0m{s}^{-2}$ for $8.0s$. How far does the boat travel during this time?

Q.

Which of the following is true about displacement?

1. Its magnitude can be greater than the distance.

2. It is a scalar quantity.

3. It cannot be zero.

4. It has both magnitude and direction

Q.

Which of the following methods can decrease the friction?

1. Applying lubricants to machinery

2. Applying powder on carrom board

3. Making shoes with spikes

4. Adding wheels in a car

Q.

A racing car has a uniform acceleration of $4{\mathrm{ms}}^{-2}$. What distance will it cover in $10\mathrm{s}$ after start?

Q.

Which all of the following are true about liquid pressure?

1. Inside the liquid, pressure increases with the increase in depth from its free surface.

2. A liquid can not exert pressure

3. In a stationary liquid, the pressure is same at all points on a horizontal plane.

4. Pressure is the same in all directions about a point inside the liquid.

Q. When the distance covered by a moving object is directly proportional to the time duration, it is said to travel with :

1. Zero velocity
2. Constant speed
3. Uniform velocity
4. Constant acceleration