**Engineering Physics Viva Questions**. We covered all the Engineering Physics Viva Questions in this post for free so that you can practice well for the exam.

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## Engineering Physics Viva Questions Objective for Students

## The nucleus finally formed in the fusion of protons in the proton-proton cycle is that of

a. Hydrogen

b. Carbon

c. Helium

d. Nitrogen

Option c – Helium

## Substances that have identical chemical properties but differ in atomic weights are called ( Engineering Physics Viva Questions )

a. Isothermals

b. Isotopes

c. Isotropics

d. Isobars

Option b – Isotopes

## The mass-energy equation was proposed by

a. Newton

b. C.V. Raman

c. Curie

d. Einstein

Option d – Einstein

## The first atomic reactor was constructed by ( Engineering Physics Viva Questions )

a. Einstein

b. Goldstein

c. Fermi

d. Wein

Option c – Fermi

## The radiant energy from the sun is the result of

a. Combustion

b. Chemical reaction

c. Nuclear fission

d. Nuclear fusion

Option d – Nuclear fusion

## The radius of the earth is 6400 km. The linear velocity of a point on the equator is near: ( Engineering Physics Viva Questions )

(A) 1000 km/hr

(B) 100 km/hr

(C) 1675 km/hr

(D) 800 km/hr

Option c – 1675 km/hr

## Two racing cars of masses m1 and m₂ are moving in circles of radii r₁ and r2 respectively. Their speeds are such that each makes a complete circle in the same duration of time t. The ratio of the linear speed of the first to the second car is

(A) m1 : m2

(B) r1 : r2

(C) 1 : 1

(D) m₁r₁ : m₂r2 .

Option b – r1 : r2

## The angular velocity of a wheel is 70 rad/s. If the radius of the wheel is 0.5 m, then its linear velocity will be : ( Engineering Physics Viva Questions )

(A) 10 m/s

(B) 20 m/s

(C) 35 m/s

(D) 70 m/s

Option c – 35 m/s

## A particle moves in a circular path 0.4 m in radius with constant speed. If a particle makes 5 revolutions in each second of its motion the speed of the particle is :

(A) 10.6 m/s

(B) 11.2 m/s

(C) 12.56 m/s

(D) 13.6 m/s

Option c – 12.56 m/s

## A stone of mass m is tied to a string of length L, and rotated in a circle with constant speed v, if the string is released the stone flies :

(A) Radially outward

(B) Radially inward

(C) Tangentially

(D) With an acceleration mv²/L

Option c – Tangentially

## A cycle wheel is rotating with uniform angular velocity w. A graph is plotted between tangential velocities of different points on a spoke and their distance from the axis. This graph is a straight line :

(A) Parallel to the velocity axis

(B) Parallel to distance axis

(C) Intersecting both velocity and distance axes

(D) Passing through the origin with a slope w

Option d – Passing through the origin with a slope w

## If the centripetal force is cut, the body will fly away in a straight line, tangential to that point. The final path will be parabola due to the: ( Engineering Physics Viva Questions )

(A) Radial force

(B) Tangential force

(C) Centrifugal force

(D) Gravitational force

Option d – Gravitational force

## A wheel rotates about an axis passing through the center and perpendicular to the plane with slowly increasing angular speed. It has :

(A) Radial velocity and radial acceleration

(B) Tangential velocity and radial acceleration

(C) Tangential velocity and tangential acceleration

(D) Tangential velocity and acceleration having both tangential and radial components

Option d – Tangential velocity and acceleration having both tangential and radial components

## A wheel completes 2000 revolutions to cover the 9.5 km distance, then the diameter of the wheel is : ( Engineering Physics Viva Questions )

(A) 1.5 m

(B) 1.5 cm

(C) 7.5 m

(D) 7.5 cm

Option a – 1.5 m

## The extremity of the minute hand of a clock moves 20 times faster than that of the hour hand, the length of the minute hand is 10 cm then the length of the hour hand is :

(A) 1 cm

(B) 2 cm

(C) 3 cm

(D) 6 cm

Option d – 6 cm

## The second hand of a watch has a length of 6 cm. The speed of the endpoint and magnitude of the difference of velocities at two perpendicular positions will be :

(A) 6.28 and 0 mm/s

(B) 8.88 and 4.44 mm/s

(C) 8.88 and 6.28 mm/s

(D) 6.28 and 8.88 mm/s

Option d – 6.28 and 8.88 mm/s

## A motor car is traveling at 20 m/s on a circular curve of radius 100 m. It is increasing its speed at the rate of 5 m/s² what is its acceleration? : ( Engineering Physics Viva Questions )

(A) 2 m/s²

(B) 4 m/s²

(C) 6.4 m/s²

(D) 9 m/s²

Option c – 6.4 m/s²

## An electric fan has blades of length 30 cm as measured from the axis of rotation. If the fan is rotating at 1200 rpm the acceleration of a point on the tip of the blade is about :

(A) 1600 m/s²

(B) 4740 m/s²

(C) 2370 m/s²

(D) 5055 m/s²

Option b – 4740 m/s²

## Two particles P and Q are located at distances rp and rQ respectively from the center of a rotating disc such that rp > rQ : ( Engineering Physics Viva Questions )

(A) Both P and Q have the same acceleration

(B) Both P and Q do not have the same acceleration

(C) P has greater acceleration than Q

(D) Q has greater acceleration than P

Option c – P has greater acceleration than Q

## A car is traveling at 30 m/s on a circular road of a radius of 300 m. It is increasing its speed at the rate of 4 m/s². The acceleration of the car is :

(A) 3 m/s²

(B) 4 m/s²

(C) 5 m/s²

(D) 7 m/s²

Option c – 5 m/s²

## A particle of mass m is moving in a horizontal circle of radius r with a uniform speed v. When it moves from one point to a diametrically opposite point it: ( Engineering Physics Viva Questions )

(A) Kinetic energy changes by mv²/4

(B) Momentum does not changes

(C) Momentum changes by 2mv

(D) Kinetic energy changes by mv²

Option c – Momentum changes by 2mv

## A particle revolves around a circular path with constant speed. The acceleration of the particle is :

(A) Along the circumference of the circle

(B) Along the tangent

(C) Along the radius

(D) Zero

Option c – Along the radius

## To enable a particle to describe a circular path, what should be the angle between its velocity and centripetal acceleration? ( Engineering Physics Viva Questions )

(A) 0°

(B) 45°

(C) 90°

(D) 180°

Option c – 90°

## In an accelerated circular motion :

(A) Angular velocity remains constant

(B) Centripetal acceleration remains constant

(C) Kinetic energy remains constant

(D) Angular velocity, centripetal acceleration, kinetic energy changes

Option d – Angular velocity, centripetal acceleration, kinetic energy changes

## A body of mass 2 kg is attached to one end of a string and is resting on a smooth horizontal table. The other end of the string passes through a smooth hole in the table and carries another mass of 0.2 kg. The length of the string on the table is 0.8 m, then the number of revolutions per minute with which the body can revolve are :

(A) 0.17 rev/min

(B) 10.7 rev/min

(C) 10.6 rev/min

(D) 17 rev/min

Option c – 10.6 rev/min

## A long beam is spun at a constant speed of 1.75 rad/s. Astronaut is made to slowly walk along this beam from the axis of rotation, the distance at which he will experience a centrifugal acceleration equal to the acceleration due to gravity : ( Engineering Physics Viva Questions )

(A) 1.75 m

(B) 3.2 m

(C) 6.2 m

(D) 9.86 m

Option b – 3.2 m

## A car is moving with a speed of 30 m/s on a circular track of radius 500 m. Its speed is increasing at the rate of 2 m/s² then its acceleration :

(A) 1.8 m/s²

(B) 2 m/s²

(C) 2.69 m/s²

(D) 3.2 m/s²

Option c – 2.69 m/s²

## A driver of a car traveling at high speed suddenly sees a board wall in front at a distance ‘s’. To avoid a collision he should :

(A) apply brakes

(B) turn the car sharply

(C) switch off the engine of the car

(D) close the eye

Option a – apply brakes

## The angular velocity of the rotating body of mass 4 kg has increased twice when the resultant force applied to it is increased by 48 N. Find the final centripetal acceleration :

(A) 4 m/s²

(B) 16 m/s²

(C) 1.6 m/s²

(D) 48 m/s²

Option b – 16 m/s²

## When the angular velocity of a uniform rotating body has increased thrice, the resultant forces applied to it increase by 60 N. Find the acceleration of the body, in two cases if the mass of the body is 3 kg :

(A) 2.5 m/s², 7.5 m/s²

(B) 7.5 m/s², 22.5 m/s²

(C) 5 m/s², 45 m/s²

(D) 2.5 m/s², 22.5 m/s²

Option d – 2.5 m/s², 22.5 m/s²

## Which of the following keeps the body in UCM by changing its direction of velocity continuously :

(A) Tangential Acceleration

(B) Radial Acceleration

(C) Torque

(D) Couple

Option b – Radial Acceleration

## A van is moving at a speed of 108 km/hr on a level road, where the coefficient of friction between tires and the road is 0.5. For the safe driving of a van, the minimum radius of curvature of the road will be : (g = 10 m/s²)

(A) 80 m

(B) 40 m

(C) 180 m

(D) 20 m

Option c – 180 m

## A cyclist going around a circle of radius 25 m completed its one revolution in 10 s the angle through which he leans inward is : (g = 9.8 m/s²)

(A) 90°

(B) 15°

(C) 45°

(D) 30°

Option c – 45°

## A motorcyclist is moving round a circular track of radius 600 m. The track is 1m wide. If his speed is 72 km/hr. How much circular track must be lifted to bank the track? (g = 9.8 m/s²)

(A) 10 cm

(B) 6 m

(C) 6.78 cm

(D) 8.33 cm

Option c – 6.78 cm

## A disc is rotating at a speed of 72 rpm. A coin is kept at a distance of 10 cm from the center of the disc. What must be the coefficient of friction between the disc and the coin so that the coin will not slide? (g = 9.8 m/s²)

(A) 0.4

(B) 0.48

(C) 0.25

(D) 0.57

Option d – 0.57

## The angle which the bicycle and its rider make with vertical when going round at 18 km/hr around a road of radius 10 m on level ground : (g = 9.8 m/s²)

(A) 16° 19′

(B) 14° 19′

(C) 24° 19′

(D) 45° 19′

Option b – 14° 19′

## A cyclist moves in a circular track of a radius of 50 m. If the coefficient of friction is 0.4 then the maximum velocity with which a cyclist takes a turn without leaning inward is : (g = 9.8 m/s²)

(A) 14 m/s

(B) 10 m/s

(C) 7 m/s

(D) 20 m/s

Option a – 14 m/s

## The maximum safe speed of the vehicle on a circular track is 15 km/hr, when a track becomes wet maximum safe speed is 10 km/hr. The ratio of the coefficient of friction of dry track to wet track is :

(A) 9 : 4

(B) 3 : 2

(C) 2 : 3

(D) 4 : 9

Option a – 9 : 4

## The string of a conical pendulum will become horizontal when :

(A) the Speed of revolution is zero

(B) the Speed of revolution is almost infinite

(C) the Speed of revolution is low

(D) the Speed of revolution is very low

Option b – the Speed of revolution is almost infinite

## A sphere of mass 0.2 kg is attached to an inextensible string of length 130 cm whose upper end is fixed to the ceiling. The sphere is made to describe a horizontal circle of radius 0.5 m then the tension in the string :

(A) 1.96 N

(B) 2 N

(C) 2.12N

(D) 5.2 N

Option c – 2.12N

## The circumference of a circular track is 1.256 km. The maximum speed at which the vehicle is safe on this track is 20 m/s then the angle of banking is :

(A) 1° 24′

(B) 2° 50′

(C) 11° 32′

(D) 45⁰

Option c – 11° 32′

## A simple pendulum is suspended from the roof of a carriage of a railway train, if the train goes around the curve of radius 50 m at 45 km/hr then the angle to which the string inclined vertically is near:

(A) 2⁰

(B) 9⁰

(C) 18⁰

(D) 30⁰

Option c – 18⁰

## The radius of curvature of a railway line at a place is 500 m and the safe speed limit is 54 km/hr then the angle of banking for this safe speed :

(A) 1⁰

(B) 4.5⁰

(C) 2⁰

(D) 2.6⁰

Option d – 2.6⁰

## For a banked road of the radius of curvature, 600 m with a safe speed of 72 km/hr elevation of the outer edge above the inner edge is if the road 10 m broad :

(A) 0.67 cm

(B) 6.7 cm

(C) 67 cm

(D) 6.7 m

Option c – 67 cm

## A train has to negotiate a curve of radius 400 m with a speed of 48 km/hr if the distance between the rails is 1 m thus the outer rail should be raised above the inner rail by a distance of

(A) 4.5 cm

(B) 9 cm

(C) 15 cm

(D) 45 cm

Option a – 4.5 cm

## A man with his hands in his pockets is standing in a bus, which is moving in a horizontal curve of a radius of 50 m with a speed of 7 m/s. How far from the vertical he must lean to keep the balance :

(A) 45⁰

(B) 30⁰

(C) 18⁰

(D) 5° 42′

Option d – 5° 42′

## A scooterist is moving around the circular track of a radius of 480 m. The track is 1 m wide, If his speed is 72 km/hr, how much outer edge of the track is lifted. to bank the track for him : (g = 10 m/s²)

(A) 10 cm

(B) 8.3 cm

(C) 16.6 cm

(D) 4.1 cm

Option b – 8.3 cm

## Keeping the angle of banking to be the same, if the maximum speed with which a vehicle can travel on the curved road is increased by 10%. What should be the increase in the radius of curvature of the curve from 20 m?

(A) 10 m

(B) 8 m

(C) 4.2 m

(D) 6.85 m

Option c – 4.2 m

## The maximum speed with which a car can be safely driven along a curved road of a radius of 30 m and banked at 30° with horizontal :

(A) 130 m/s

(B) 1.303 m/s

(C) 14.00 m/s

(D) 13.03 m/s

Option d – 13.03 m/s

## A road is banked with an angle of 0.01 radian. If the radius of the road is 80 m, then the safe speed for the drive will be : (g = 10 m/s²)

(A) 2.828 m/s

(B) 3.828 m/s

(C) 4.828 m/s

(D) 5.828 m/s

Option a – 2.828 m/s

## A boy on a cycle pedals around a circle of radius 20 m at a speed of 20 m/s. The combined mass of the boy and the cycle is 90 kg. The angle that the cycle makes vertical so that he may not fall : (g = 9.8 m/s²)

(A) 60.25 °

(B) 63.90 °

(C) 26.12 °

(D) 30.00 °

Option b – 63.90 °

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