Physics

Q.

Browsing through Mr. Fox's old scientific notes, Bruce Wayne encounters a secret temperature scale, which Mr. Fox called Z, in order to keep the Bat mobile's technology a secret. On that scale, the freezing and the boiling points of water were recorded to be -7⁰Z and 78⁰Z, respectively. The records instruct to maintain the coolant temperature at -24⁰Z for top speed. Mr. Wayne, naturally comfortable with the Fahrenheit scale due to his American upbringing, needs to calculate the coolant temperature in ⁰F. Help him choose the correct value

1. 10⁰F

2. 5⁰F

3. 0⁰F

4. -4⁰F

Q.

The maximum horizontal range is given by

1. 2u sinθ/g

2. 2u cosθ/g

3. u²/g

4. 

Q.

A tennis ball bounces higher on hills than on planes. Which statement gives the correct reason-

1. atmospheric pressure is lower on hills

2. value of temperature is lower on hills

3. value of g on hills is more than that of plane

4. value of g on hills is less than that of plane

Q.

Two stones are thrown up simultaneously from the edge of a cliff 240 m high with initial speed of 10 m/s and 40 m/s respectively. Which of the following graph best represents the time variation of relative position of the second stone with respect to the first? (Assume stones do not rebound after hitting the ground and neglect air resistance, take g = 10 m/s²).

(The figures are schematic and not drawn to scale)

1. 

2. 

3. 

4. 

Q.

When a projectile is thrown up at an angle θ to the ground, the time taken by it to rise and to fall are related as

1. time of rise > time of fall

2. time of rise can be less than or equal to time of fall

3. they are equal

4. time of rise < time of fall

Q.

A battle ship simultaneously fires two shells at enemy ships. Both are fired with the same speed but with different directions as shown. If the shells follow the parabolic trajectories shown, which ship gets hit first?

1. Need more information about the trajectories.

2. Ship μ1

3. They get hit at the same time.

4. Ship μ2

Q.

At what angle should a projectile with initial velocity 'v' be thrown, so that it achieves its maximum range?

1. 90°

2. 60°

3. 45°

4. 30°

Q.

If a projectile is thrown with a velocity 10 ms^-1 at an angle of 30⁰ with the horizontal. Then the time of flight will be

1. 1 s

2. 2 s

3. 4 s

4. 3 s

Q.

Which statement is true for a ball thrown at 20 degrees with the horizontal, when it is at the highest point in its trajectory?

1. Its velocity is zero but its acceleration is nonzero

2. Its velocity is perpendicular to its acceleration

3. Its velocity and acceleration are both zero

4. Its velocity is nonzero but its acceleration is zero

Q.

Which one of the following is not an example of projectile?

1. A kicked football.

2. Taking off of an aircraft.

3. A bullet fired from a gun.

4. A javelin thrown by an athlete.