Home
Current Affairs January 2024

What is the correct answer?

4

The velocity of a body fallen from height h, on reaching the ground is given by

A. v = 2gh

B. v = 2gh2

C. v = √(2gh)

D. v = 1/√(2gh)

Correct Answer :

C. v = √(2gh)


Related Questions

What is the correct answer?

4

The horizontal reaction at the support A of the structure shown in below figure, is

A. Zero

B. 2 t

C. 3 t

D. 1 t

What is the correct answer?

4

It is observed that in a certain sinusoidal oscillation, the amplitude is linearly dependent on the frequency f. If the maximum velocity during the oscillation is V, then V must be proportional to

A. f

B. 1/f

C. 1/f²

D.

What is the correct answer?

4

A marble ball is rolled on a smooth floor of a room to hit a wall. If the time taken by the ball in returning to the point of projection is twice the time taken in reaching the wall, the coefficient of restitution between the ball and the wall, is

A. 0.25

B. 0.50

C. 0.75

D. 1.0

What is the correct answer?

4

Moment of inertia of a squares of side b about an axis through its centre of gravity, is

A. b3/4

B. b4/12

C. b4/3

D. b4/8

What is the correct answer?

4

A 49 kg lady stands on a spring scale in an elevator. During the first 5 sec, starting from rest, the scale reads 69 kg. The velocity of the elevator will be

A. 10 m/sec

B. 15 m/sec

C. 20 m/sec

D. 25 m/sec

What is the correct answer?

4

A light rope is loaded with many equal weights at equal horizontal intervals. The points of suspension on the rope lie on a

A. Parabola

B. Catenary

C. Cycloid

D. Ellipse

What is the correct answer?

4

The acceleration of a train starting from rest at any instant is 1/6(V + 1) m/sec² where V is the velocity of the train in m/sec. The train will attain a velocity of 36 km/hour after travelling a distance of

A. 2000 m

B. 2100 m

C. 2200 m

D. 2300 m

What is the correct answer?

4

A number of forces acting simultaneously on a particle of a body

A. May not be replaced by a single force

B. May be replaced by a single force

C. May be replaced by a single force through C.G. of the body

D. May be replaced by a couple

What is the correct answer?

4

The maximum displacement of a particle executing S.H.M. corresponds to

A. Zero potential energy and maximum kinetic energy

B. Zero kinetic energy and maximum potential energy

C. Maximum kinetic energy and maximum potential energy

D. Minimum kinetic energy and minimum potential energy

What is the correct answer?

4

If A is the amplitude of particle executing simple harmonic motion, then the total energy E of the particle is

A. Proportional to A

B. Proportional to A²

C. Proportional to 1/A²

D. Independent of A

What is the correct answer?

4

Angular acceleration of a particle may be expressed as

A. Radians/sec2

B. Degrees/sec2

C. Revolutions/sec

D. All the above

What is the correct answer?

4

The velocity of a body fallen from height h, on reaching the ground is given by

A. v = 2gh

B. v = 2gh2

C. v = √(2gh)

D. v = 1/√(2gh)

What is the correct answer?

4

For the system of the loads shown in below figure, the time required for the 6.6 kg load to fall on the edge, is

A. 1 sec

B. 2 sec

C. 3 sec

D. 4 sec

What is the correct answer?

4

The maximum value of the horizontal range for a projectile projected with a velocity of 98 m/sec is

A. 98 m

B. 490 m

C. 980 m

D. 1960 m

What is the correct answer?

4

A ball moving on a smooth horizontal table hits a rough vertical wall, the coefficient of restitution between ball and wall being 1/3. The ball rebounds at the same angle. The fraction of its kinetic energy lost is

A. 1/3

B. 2/3

C. 1/9

D. 8/9

What is the correct answer?

4

If the direction of projection bisects the angle between the vertical and the inclined plane, then the range of projectile on the inclined plane is

A. Zero

B. Maximum

C. Minimum

D. None of these

What is the correct answer?

4

Pick up the correct statement from the following. The kinetic energy of a body

A. Before impact is equal to that after impact

B. Before impact is less than that after impact

C. Before impact is more than that after impact

D. Remain constant

What is the correct answer?

4

Joule is the unit of

A. Power

B. Impulse

C. Work

D. Momentum

What is the correct answer?

4

A system of coplanar forces acting on a rigid body can be reduced to

A. One force only

B. One couple only

C. One force and one couple only

D. None of the above

What is the correct answer?

4

A stone was thrown vertically upwards from the ground with a velocity of 50 m/sec. After 5 seconds another stone was thrown vertically upwards from the same place. If both the stones strike the ground at the same time, then the velocity with which the second stone was thrown should be (Assume g = 10 m/sec²)

A. 15 m/sec

B. 25 m/sec

C. 40 m/sec

D. 50 m/sec

What is the correct answer?

4

Principle of Transmissibility of Forces states that, when a force acts upon a body, its effect is

A. Maximum if it acts at the centre of gravity of the body

B. Different at different points on its line of

C. Same at every point on its line of action

D. Minimum if it acts at the C.G. of the body

What is the correct answer?

4

The force which produces an acceleration of 1 m/sec2 in a mass of one kg, is called

A. Dyne

B. Newton

C. Joule

D. Erg

What is the correct answer?

4

The ratio of the moment of inertia of a rectangle about its centroidal axis to the moment of inertia about its base, is

A. 1/4

B. 1/2

C. 3/4

D. 2

What is the correct answer?

4

ω rad/sec is the angular velocity of a crank whose radius is r. If it makes θ° with inner dead centre and obliquity of the connecting rod l is , the velocity v of the piston, is given by the equation

A. ω2 (l cos + r sin tan θ)

B. ω2 (l sin + r cos φ tan θ)

C. ω (l sin + r cos tan θ)

D. ω2 (l sin - r cos θ tan )

What is the correct answer?

4

The total kinetic energy of a hoop of mass 2 kg and radius 4 m sliding with linear velocity 8 m/sec and angular velocity 5 radian/sec is

A. 64 J

B. 400 J

C. 464 J

D. 89 J

What is the correct answer?

4

0.For maximum range of a projectile, the angle of projection should be

A. 30°

B. 45°

C. 60°

D. None of these

What is the correct answer?

4

A square hole is punched out of a circular lamina, the diagonal of the square being the radius of the circle. If r is the radius of the circle, the C.G. of the remainder from the corner of the square on the circumference will be

A. [r (π + 0.25)]/(π - 0.5)

B. [r (π - 0.5)]/(π + 0.25)

C. [r (π - 0.25)]/(π - 0.5)

D. [r (π + 0.25)]/(π + 0.5)

What is the correct answer?

4

A ball moving with a velocity of 5 m/sec impinges a fixed plane at an angle of 45° and its direction after impact is equally inclined to the line of impact. If the coefficient of restitution is 0.5, the velocity of the ball after impact will be

A. 0.5 m/sec

B. 1.5 m/sec

C. 2.5 m/sec

D. 3.5 m/sec

What is the correct answer?

4

Which of the following is a scalar quantity?

A. Energy

B. Momentum

C. Torque

D. Impulse

What is the correct answer?

4

The angle of projection at which the horizontal range and maximum height of a projectile are equal to

A. 36°

B. 45°

C. 56°

D. 76°