Velocity(Speed with Direction)

Q. What does a horizontal line on a speed-time graph indicate?

1. Constant speed
2. Constant acceleration
3. Constant distance
4. Can't say

Q. If a piece of stone tied at the end of a thread is whirled in a horizontal circle with uniform speed with the help of hand then answer the below question:
Is the acceleration of stone uniform or variable?

Q. An aeroplane flying at a constant speed releases a bomb. As the bomb moves away from the aeroplane, it will

1. Always fall behind the aeroplane
2. Always be vertically below the aeroplane only if the aeroplane was flying at an angle of ${45}^{\circ }$ to the horizontal
3. Always be vertically below the aeroplane
4. Gradually fall behind the aeroplane if the aeroplane was flying horizontally

Q. Four cars A, B, C and D are moving on a levelled road. Their distance versus time graphs are shown in the figure. Choose the correct statement.

1. Car D is faster than car C.
2. Car C is the slowest.
3. Car A is faster than car D.
4. Car B is the slowest.

Q. Average velocity and average speed is same for:

1. A flight travelling between Delhi to Kolkata.
2. A car making a round trip on a circular track.
3. A one-way trip on a straight road.
4. A car going from Delhi to Mumbai on a zig-zag road.

Q.

A particle is moving from point A to point B and covers the entire distance of 10 km in just 2 minutes. What would be the speed at which the particle was traveling?

1. $53.3m{s}^{-1}$

2. $80.3m{s}^{-1}$

3. $83.3m{s}^{-1}$

4. $90.3m{s}^{-1}$

Q. A body goes from C to D with a velocity of $20m{s}^{-1}$ and comes back from D to C with a velocity of $30m{s}^{-1}$. The average velocity of the body during the whole journey is:

1. $25m{s}^{-1}$
2. 0
3. $20m{s}^{-1}$
4. $26m{s}^{-1}$

Q. The velocity of a car is $18m{s}^{-1}$. Express this velocity in $km{h}^{-1}$.

1. $70km{h}^{-1}$
2. $65km{h}^{-1}$
3. $75km{h}^{-1}$
4. $69km{h}^{-1}$

Q. Which of the following statement is correct for a round trip along the same route?

1. The average speed is zero.
2. The average velocity is zero.
3. Both the average velocity and average speed are non-zero.
4. The average velocity is half of the average speed.

Q. Which among the following statement is false?

1. If speed is constant, then its velocity must also be constant.
2. If speed is zero, then its velocity must also be zero.
3. If velocity is constant, then its speed must also be constant.
4. If average velocity is zero, then its average speed need not be zero.

Q. Among the following, which one moves with a non-uniform velocity?

1. Sound in a homogeneous medium.
2. All of the above.
   
3. Light in a homogeneous medium.
4. A freely falling body.

Q. A car travels from Bangalore to Mumbai and returns in $20hours$. What is the average velocity and average speed of the car if odometer reading of the car, when it started was $2200km$ and when finished was $3800km$?

1. $\text{Average velocity = 0 kmph}$
   $\text{Average speed = 0 kmph}$
2. $\text{Average velocity = 0 kmph}$
   $\text{Average speed = 80 kmph}$
3. $\text{Average velocity = 80 kmph}$
   $\text{Average speed = 80 kmph}$
4. $\text{Average velocity = 80 kmph}$
   $\text{Average speed = 0 kmph}$

Q.

A car takes $4hours$ to travel from Bangalore to Chennai, whereas a flight takes only $30minutes$ to travel from Bangalore to Chennai. If the distance from Bangalore to Chennai by road is $400km$ and by air is $150km$, find the average speed of flight and the average speed of car respectively.

1. $300km{h}^{-1},37.5km{h}^{-1}$
2. $300km{h}^{-1},120km{h}^{-1}$
3. $300km{h}^{-1},200km{h}^{-1}$
4. $300km{h}^{-1},100km{h}^{-1}$

Q. An insect moves along a circular path of radius 10 cm with a constant speed. If it takes 1 minute to move from a point on the path to the diametrically opposite point, then the distance covered, speed, displacement and velocity respectively are

1. 3.14 cm, 3.14 cm/min, 10 cm, 10 cm/min
2. 0.314 cm, 0.314 cm/min, 1 cm, 1 cm/min
3. 31.4 cm, 31.4 cm/min, 20 cm, 20 cm/min
4. 314 cm, 314 cm/min, 0.1 cm, 0.1 cm/min