Types of Force

Q.

Describe how communities have conserved and protected forests and wildlife in India.

Q.

Hot spots are regions of high _______.

1. extinct species

2. biodiversity

3. ecological interaction

4. endangered species

Q. A ball is thrown vertically upwards which attains a maximum height of $20m$. Calculate the velocity with which the ball is thrown upwards? (Take $g=9.8m{s}^{-2}$)

1. $17.79m{s}^{-1}$
2. $19.79m{s}^{-1}$
3. $29.79m{s}^{-1}$
4. $15.79m{s}^{-1}$

Q.

Two bodies A and B of masses m₁ and m₂ when separated by a distance d exert a force F on each other. What happens if the air in the space is replaced by a vacuum?

Q. Which of the following is a biodiversity hotspot?

1. Glacier
2. River
3. Desert
4. Forest

Q.

How the industrialists as stakeholders of forests take benefit of forest products?

Q.

Which of the following is not the function of forest?

1. It is used to make paper

2. Resin, gum and drugs are obtained

3. Controls flood

4. Causes soil erosion

Q.

A man throws a ball vertically upwards with a velocity of $20\mathrm{m}/\mathrm{s}$. After what time will the ball come back to his hands. (Take $\mathrm{g}=10\mathrm{m}/{\mathrm{s}}^2$).

Q.

What is the net force?

1. None of the above

2. 5 N

3. 0 N

4. 10 N

Q.

In which direction should force be applied, in order to stop a trolley moving downward on the frictionless staircase?

1. Along the direction of motion

2. Opposite to the direction of motion

3. Normal upward to the direction of motion

4. Normal downward to the direction of motion

Q.

A satellite orbits the Earth with an elliptical orbit modeled by $x$ squared over $47$ million three hundred thirty four thousand four hundred plus y squared over forty three million nine hundred fifty six thousand nine hundred equals $1$ comma where the distances are measured in km.

The Earth shares the same center as the orbit. If the radius of the Earth is $6370km$ , what is the maximum distance between the satellite and the Earth?

Q.

Among the stakeholders which one of them causes the maximum damage to forest?

1. People who live in or around the forest

2. The industrialists

3. The wildlife and nature enthusiasts

4. The forest department of the government

Q.

In the diagram, two friends are pushing a stationary box in the opposite direction as shown below. Which direction will the block move?

1. East

2. West

3. The box will not move

4. Cant say

Q. Two-point objects with different masses are kept at a distance $R$ apart from each other. If the gravitational force between them is $F$, then which of the following relation is correct?

1. $F\propto R^2$
2. $F\propto R^4$
3. $F\propto \frac{1}{R^2}$
   
4. $F\propto R$

Q. Person X and Y are pushing a block against each other and the block does not move. This is because the net force is .

1. zero
2. negative
3. positive

Q.

A cricket ball is thrown upward with a velocity of 60 m/sec (a = -10 $\mathrm{m}/{\mathrm{s}}^2$ ). Calculate the time taken by the ball to reach the maximum height.

Q. In a tug of war, two teams are pulling a rope, but still the rope is not moving either side. So the forces are:

1. Unbalanced forces
2. Balanced forces
3. Gravitational forces
4. Electrostatic forces

Q. Calculate the net force on the body shown.

1. 30 N
2. 70 N
3. 50 N
4. 0 N

Q. A rope is being pulled with a force of $100N$ and $80N$ in opposite directions. The net force acting on the rope is

1. $80N$
2. $100N$
3. $180N$
4. $20N$

Q. The Chipko movement is associated with.

1. saving forests
2. saving fossil fuels
3. water pollution
4. saving wildlife

Q. What is the magnitude of net force in the given situation?

1. $2N$
2. $5N$
3. $1N$
4. $0.5N$

Q. If the resultant of all the forces acting on a body is , the forces are called balanced forces.

1. unity
2. zero
3. infinite

Q.

Ground water will not be depleted by ___.

1. thermal power plants

2. afforestation

3. sowing of high water demanding crops

4. loss of forest, and decreased rainfall

Q.

The force of attraction between two unit point masses separated by a unit distance is called

1. gravitational potential

2. acceleration due to gravity

3. gravitational field

4. universal gravitational constant

Q.

Jaikishan and Arun are pushing each other as shown in the given figure. Jaikishan’s push is weaker than that of Arun. As a result, they move in the direction shown in the figure.

Jaikishan and Arun move in the given direction because of:

1. Unbalanced force

2. Gravitational force

3. Balanced force

4. Tension force

Q. In the above figure, the arrows indicate the direction of forces $F_1$ and $F_2$ and the magnitudes of the respective force are given above the arrows. Initially the block is at rest. Towards which direction will the block move?

1. The block will move towards the direction of $F_1$ force.
2. The block will not move as the forces are balanced.
3. The block will move towards the direction of force $F_2$.
4. The direction of motion cannot be determined.

Q. The net force applied on an object is taken as the sum of the magnitudes if they act in directions.

1. opposite
2. different
3. same

Q. Given in the figure are three cases with the directions and magnitudes of forces indicated accordingly. Which of the three boxes is experiencing balanced force?

1. Box (i)
2. Box (iii)
3. Box (ii)
4. Both the boxes (i) and (ii)