Black Hole

Basic

Moderate

Challenging

Difficult

Black Hole

Question 1 

A force of 10 N can be resolved along directions AB and AC, where AB and AC are perpendicular to each other. 

The component of the force in the AC direction is 6 N. What is the magnitude of the component along the AB direction?

1. 2 N
2. 4 N
3. 6 N
4. 8 N

Question 2 

Which of the following answer options has two vector and two scalar quantities?

1. Force, momentum, mass, acceleration
2. Kinetic energy, velocity, potential difference, displacement
3. Speed, potential energy, temperature, current
4. Charge, impulse, power, time

Question 3 

A person swims across a river that is flowing east. In what direction does the person have to swim so that she only moves towards the south from her starting point?

Question 4 

The vectors below represent the displacement of two cars.

What is the direction of S_{A}-S_{B}?

Question 5 

Which of the following is a vector quantity?

1. Electric current
2. Distance
3. Pressure
4. Electric field strength

Question 6 

A biker travels at a constant speed of 8 m s^{-1} west during a minute and then at a constant speed of 6 m s^{-1} south during a minute. What is the average speed of the biker during these two minutes?

1. 5 m s^{-1}
2. 7 m s^{-1}
3. 10 m s^{-1}
4. 14 m s^{-1}

Question 7 

Three forces with magnitudes A, B, and C lie in the same plane and act on an object. The object is in equilibrium. 

Which of the following equations is correct?

1. A = B + C
2. Asin\alpha = B
3. Csin\alpha = A - Bcos\alpha
4. Acos\alpha = C

Question 8 

Which of the following answer options includes three scalar quantities?

1. Mass, speed, weight, magnetic field strength
2. Acceleration, time, temperature, velocity
3. Electric current, electric field strength, displacement, charge
4. Gravitational potential energy, amplitude, momentum, power

Question 9 

A block of mass m is sliding down a frictionless slope. The angle that the slope makes with the horizontal is \beta. 

The normal reaction force that acts on the block is R. What is the resultant force on the block?

1. mgsin\beta
2. mgcos\beta
3. Rsin\beta
4. Rcos\beta

Question 10 

Two perpendicular forces of magnitudes 9 N and 12 N act on an object. The magnitude of the resultant force on the object is:

1. 3 N
2. 11 N
3. 15 N
4. 21 N