A body of weight \(\mathrm{w}_{1}\) is suspended from the ceiling of a room through a chain of weight \(\mathrm{w}_{2}.\)The ceiling pulls the chain by a force:

1.	\(\mathrm{w}_{1}\)	2.	\(\mathrm{w}_{2}\)
3.	\(\mathrm{w}_{1}+\mathrm{w}_{2}\)	4.	\(\dfrac{\text w_{1}+\text w_{2}}{2}\)

When a horse pulls a cart, the force that helps the horse to move forward is the force exerted by:

A car accelerates on a horizontal road due to the force exerted by

1. the engine of the car

2. the driver of the car

3. the earth

4. the road

A block of mass \(10\) kg is suspended through two light spring balances as shown in the figure:

A block of mass m is placed on a smooth inclined plane of inclination θ with the horizontal. The force exerted by the plane on the block has a magnitude

1. mg

2. mg/cosθ

3. mg cosθ

4. mg tanθ

A block of mass m is placed on a smooth wedge of inclination θ. The whole system is accelerated horizontally so that the block does not slip on the wedge. The force exerted by the wedge on the block has a magnitude:

1. mg

2. mg/cosθ

3. mg cosθ

4. mg tanθ

Neglect the effect of rotation of the earth. Suppose the earth suddenly stops attracting objects placed near its surface. A person standing on the surface of the earth will:

Three rigid rods are joined to form an equilateral triangle ABC of side 1 m. Three particles carrying charges 20 pC each are attached to the vertices of the triangle. The whole system is at rest in an inertial frame. The resultant force on the charged particle at A has the magnitude.

1. zero

2. 3.6 N

3. \(36\sqrt 3\)N

4. 7.2 N

A force \(F_1\) acts on a particle so as to accelerate it from rest to a velocity \(v.\) The force \(F_1\) is then replaced by \(F_2\) which decelerates it to rest.
1. \(F_1\) must be equal to \(F_2\)
2. \(F_1\) may be equal to \(F_2\)
3. must be unequal to \(F_2\)
4. none of these

Two objects \(A\) and \(B\) are thrown upward simultaneously with the same speed. The mass of \(A\) is greater than the mass of \(B\). Suppose the air exerts a constant and equal force of resistance on the two bodies.