Practice paper · Mid-term

The closeness of a measurement to the true value of the physical quantity is known as:

1. APrecision
2. BAccuracy
3. CResolution
4. DSystematic Error

Which of the following scenarios is physically possible?

1. AAn object has constant non-zero velocity but a varying acceleration.
2. BAn object has a constant non-zero acceleration but its velocity is zero at an instant.
3. CAn object has a positive acceleration but its speed is decreasing.
4. DAn object moves in a circle with constant velocity.

A car travels from point A to point B, which is 5 km away, and then returns to point A. The entire trip takes 1 hour. Which of the following statements is true for the entire trip?

1. AThe average speed is 10 km/h and the average velocity is 10 km/h.
2. BThe average speed is 10 km/h and the average velocity is 0 km/h.
3. CThe average speed is 0 km/h and the average velocity is 10 km/h.
4. DThe average speed is 0 km/h and the average velocity is 0 km/h.

The quantities which have the same dimensions as those of solid angle are:

1. Astrain and stress
2. Bstress and angle
3. Cstrain and angle
4. Dstrain and radius

A student is standing still in a park, and rain is falling vertically downwards. The student then starts running forward at a constant speed. To stay as dry as possible, how must the student hold their umbrella?

1. AVertically, just as when they were standing still.
2. BTilted forward, in the direction they are running.
3. CTilted backward, against the direction they are running.
4. DThe angle of the umbrella doesn't matter as the rain is falling vertically.

A bullet is fired from a gun at the speed of 280 m s⁻¹ in the direction 30° above the horizontal. The maximum height attained by the bullet is (g = 9.8 m s⁻², sin30° = 0.5)

1. A2800 m
2. B2000 m
3. C1000 m
4. D3000 m

A salad spinner is used to dry washed lettuce. The lettuce is placed in a perforated basket that spins at a high speed. The water droplets fly off the lettuce and escape through the holes in the basket. Which physics principle best explains why the water separates from the lettuce?

1. AA strong centrifugal force pushes the water outwards.
2. BThe force of gravity becomes stronger at high speeds, pulling the water out.
3. CThe basket wall provides an inward centripetal force to the lettuce, but when a water droplet reaches a hole, this force vanishes, and the droplet continues in a straight-line tangent to its path due to inertia.
4. DThe high speed of rotation reduces the air pressure inside, sucking the water out.

Chose the correct statement in the following:

1. AIn an elastic collision of two bodies, the momentum and energy of each body is conserved.
2. BTotal energy of a system is always conserved, no matter what internal and external forces on the body are present.
3. CWork done in the motion of a body over a closed loop is zero for every force in nature.
4. DIn an inelastic collision, the final kinetic energy is always less than the initial kinetic energy of the system.