Physics - Laws Motion - Quiz-1

Two bodies of equal masses revolve in circular orbits of radii R₁ and R₂ with the same period. Their centripetal forces are in the ratio

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${(\frac{R_{2}}{R_{1}})}^{2}$
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$\frac{R_{1}}{R_{2}}$
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${(\frac{R_{1}}{R_{2}})}^{2}$
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$\sqrt{R_{1} R_{2}}$

A body is imparted motion from rest to move in a straight line. If it is then obstructed by an opposite force, then:

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The body may necessarily change direction
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The body is sure to slow down
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The body will necessarily continue to move in the same direction at the same speed
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None of these

For a rocket moving in free space, the fraction of mass to be disposed of Off to attain a speed equal to two times the exhaust speed is given by (given $e^{2}$ = 7.4)

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0.40
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0.37
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0.50
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0.86

The length of a spring is $l_{1} a n d l_{2}$ when stretched with a force of 4 N and 5 N respectively. Its natural length is?

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$l_{2} + l_{1}$
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$2 (l_{2} - l_{1})$
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$5 l_{1} - 4 l_{2}$
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$5 I_{2} - 4 l_{1}$

A simple pendulum hangs from the roof of a train moving on horizontal rails. If the string is inclined towards the front of the train, then train is-

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Moving with constant velocity
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In accelerated motion
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In retarded motion
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At rest

A lighter body and heavier body both are moving with same momentum and applied same retarding force. Their stoping distances are $s_{1} a n d s_{2}$ respectively. Then the correct relation between $s_{1} a n d s_{2}$ -

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$s_{1} > s_{2}$
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$s_{1} < s_{2}$
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$s_{1} = s_{2}$
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None of these

When a 5 kg plastic box is placed deep inside water, it accelerates at a rate of g/6. How much sand should be put inside the box so that it may accelerate down at the rate of g/6?

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2kg
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3kg
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4kg
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5kg

Let $θ$ denote the angular displacement of a simple pendulum oscillating in a vertical plane. If the mass of bob is m, the tension in the string is mgcos $θ$ -

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always
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never
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at extreme
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at mean position

The graph for stopping time (t) versus mass (m) is shown in the figure. Then which one of the pairs is given?

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Momentum, force
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K.E., force
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Velocity, force
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None of these

A metal ring of mass m and radius R is placed on smooth horizontal table and is set rotating about its own axis in such a way that each part of the ring moves with a speed v. Tension in the ring is:

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$\frac{m v^{2}}{R}$
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$\frac{m v^{2}}{2 R}$
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$\frac{m v^{2}}{2 π R}$
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None of these

Tension on the string at point P is T. The graph for tension (T) versus x is shown in the figure. Then the string is:

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massless
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massfull
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tension on every point on the string is same when the string is having finite mass 4
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None of these

While walking on ice one should take small steps to avoid slipping. This is because smaller steps ensure

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Larger friction
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Smaller friction
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Larger normal force
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Smaller normal force

A block is kept on a rough inclined plane with angle of inclination $θ$ . The graph of net reaction (R) versus $θ$ is:

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0%
0%
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(4) None of these

A block is placed on a rough horizontal plane. A time dependent horizontal force F=kt acts on the block. The acceleration time graph of the block is :

A motorcycle is going on an overbridge of radius R. The driver maintains a constant speed. As the motorcycle is ascending on the overbridge, the normal force on it:

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Increases
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decreases
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remains the same
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fluctuates erratically

A rod of length L and mass m is acted on by two unequal forces $F_{1}$ and $F_{2} (< F_{1})$ as shown in the following figure

The tension in the rod at a distance y from the end A is given by :

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$F_{1} (1 - \frac{y}{L}) + F_{2} (\frac{y}{L})$
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$F_{2} (1 - \frac{y}{L}) + F_{1} (\frac{y}{L})$
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$(F_{1} - F_{2}) \frac{y}{L}$
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None of the above

Two blocks 'A' and 'B' each of mass 'm' are placed on a smooth horizontal surface. Two horizontal force F and 2F are applied on both the blocks 'A' and 'B' respectively as shown in figure. The block A does not slide on block B. Then the normal reaction acting between the two blocks is:

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F
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F/2
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$\frac{F}{\sqrt{3}}$
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3F

Five persons A, B, C, D & E are pulling a cart of mass 100 kg on a smooth surface and the cart is moving with acceleration 3 $m / s^{2}$ in east direction. When person 'A' stops pulling, it moves with acceleration 1 $m / s^{2}$ in the west direction. When person 'B' stops pulling, it moves with acceleration 24 $m / s^{2}$ in the north direction. The magnitude of the acceleration of the cart when only A & B pull the cart keeping their directions same as the old directions are:

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$3 \sqrt{71} m / s^{2}$
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26 $m / s^{2}$
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25 $m / s^{2}$
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30 $m / s^{2}$

A body moves along an uneven surface with constant speed at all points.

The normal reaction due to ground on the body is:

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maximum at A
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maximum at B
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minimum at C
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the same at A, B and C

Two masses, m and M, are connected by a light string passing over a smooth pulley. When mass m moves up by 1.4 m in 2 sec, the ratio $\frac{m}{M}$ is:

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$\frac{13}{15}$
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$\frac{15}{13}$
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$\frac{9}{7}$
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$\frac{7}{9}$

The engine of a car produces an acceleration of 4 m/s² in the car. If this car pulls another car of the same mass, what will be the acceleration produced?

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8 m/s²
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2 m/s²
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4 m/s²
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$\frac{1}{2} m / s^{2}$

A truck and a car are moving with equal velocity. If equal retarding force is applied on each, then on applying the brakes both will stop after certain distance

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Truck will cover less distance before rest
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Car will cover less distance before rest
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Both will cover equal distance
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None

A constant force acts on a body of mass 0.9 kg at rest for 10s. If the body moves a distance of 250 m, the magnitude of the force is

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3 N
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3.5 N
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4.0 N
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4.5 N

A body of 5 kg is moving with a velocity of 20 m/s. If a force of 100 N is applied on it for 10 sec in the same direction as its velocity, what will now be the velocity of the body?

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200 m/s
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220 m/s
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240 m/s
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260 m/s

A cyclist turns around a curve at 15 miles/hour. If he turns at double the speed, the tendency to overturn is

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Doubled
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Quadrupled
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Halved
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Unchanged

If the overbridge is concave instead of being convex, the thrust on the road at the lowest position will be

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$m g + \frac{m v^{2}}{r}$
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$m g - \frac{m v^{2}}{r}$
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$\frac{m^{2} v^{2} g}{r}$
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$\frac{v^{2} g}{r}$

A car sometimes overturns while taking a turn. When it overturns, it is:

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the inner wheel which leaves the ground first.
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the outer wheel which leaves the ground first.
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both the wheels leave the ground simultaneously.
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either wheel leaves the ground first.

A motor cyclist moving with a velocity of 72 km/hour on a flat road takes a turn on the road at a point where the radius of curvature of the road is 20 meters. The acceleration due to gravity is 10 m/sec². In order to avoid skidding, he must not bend with respect to the vertical plane by an angle greater than

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$θ = \tan^{- 1} 6$
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$θ = \tan^{- 1} 2$
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$θ = \tan^{- 1} 25 .92$
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$θ = \tan^{- 1} 4$

A particle moves in a circular orbit under the action of a central attractive force inversely proportional to the distance ‘r’. The speed of the particle is

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Proportional to r²
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Independent of r
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Proportional to r
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Proportional to 1/r

Two masses M and m are attached to a vertical axis by weightless threads of combined length l. They are set in rotational motion in a horizontal plane about this axis with constant angular velocity ω. If the tensions in the threads are the same during motion, the distance 'x' of M from the axis is-

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$\frac{M l}{M + m}$
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$\frac{m l}{M + m}$
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$\frac{M + m}{M} l$
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$\frac{M + m}{m} l$

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Practice Physics Quiz Questions and Answers

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Practice Physics Quiz Questions and Answers

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