Que- What is the angle of projection for which the range and maximum height become equal?
a. tan-1 1/4
b. tan-1 4
c. tan-1 1/2
d. tan-1 2
Answer- tan-1 4
Que- The thrust on the rocket in the absence of gravitational force of attraction is
a. constant
b. not constant
c. constant if the rate of ejected gases is constant
d. constant for short range rocket.
Answer- constant
Que- When two bodies move toward each other with constant speeds the distance between them decreases at the rate of 6m / sec. If they move in the same direction the distance between them increases at the rate of 4m/sec. Then their speeds are
a. 5m/s, 1m/s
b. 3m/s, 3m/s
c. 6m/s, 1m/s
d. 4m/s, 2m/s
Answer- 5m/s, 1m/s
Que- Distance covered by a freely falling body in 2 seconds will be
a. 4.9 m
b. 19.6 m
c. 39.2 m
d. 44.1 m
Answer- 19.6 m
Que- The distance covered by a body in time t starting from rest is
a. at2/2
b. Vt
c. a2t/2
d. at2
Answer- at2/2
Que- Flight of a rocket in the space is an example of
a. second law of motion
b. third law of motion
c. first law of motion
d. law of gravitation
Answer- third law of motion
Que- The trajectory (or path) of a projectile is
a. straight line
b. parabola
c. hyperbola
d. circle
Answer- parabola
Que- At which angle the range of the projectile is maximum
a. 45 Degree
b. 60 Degree
c. 30 Degree
d. none
Answer- 45 Degree
Que- The force beared by a wall on which water strikes normally at a speed of 10m/sec and at a discharge of 0.0001m3/sec is.
a. 1 N
b. 10 N
c. 100 N
d. none
Answer- 1 N
Que- Time rate of change of momentum is equal to
a. force
b. impulse
c. velocity
d. both (a) and (c)
Answer- force
Que- The range of the projectile at 30? and 60? are
a. equal to 45?
b. equal to 90?
c. equal to each other
d. none of the above
Answer- equal to each other
Que- Why Ballistic missile fails in some circumstances of precision.
a. due to their shape
b. due to air resistance
c. due to angle of projection
d. att of these
Answer- due to air resistance
Que- Work done will be maximum if the angle between the force F and displacement d is
a. 45 Degree
b. 90 Degree
c. 180 Degree
d. 0 Degree
Answer- 0 Degree
Que- A field in which the work done in a moving a body along closed path is zero is called
a. electric field
b. conservative field
c. electromagnetic field
d. gravitational field
Answer- conservative field
Que- When a force is parallel to the direction of motion of the body, then work done on the body is
a. zero
b. minimum
c. infinity
d. maximum
Answer- maximum
Que- Which of the following types of force can do no work on the particle on which it acts?
a. frictional force
b. gravitational force
c. elastic force
d. centripetal force
Answer- centripetal force
Que- If a body a mass of 2 kg is raised vertically through 2m, then the work done will be
a. 38.2 J
b. 392.1 J
c. 39.2 J
d. 3.92 J
Answer- 39.2 J
Que- An elevator weighing 3.5 x 10-6 N is raised to a height of 1000 m in the absence of friction, the work done is
a. 3.5 x 103 J
b. 3.5 x 104 J
c. 3.5 x 106 J
d. 3.5 x 109 J
Answer- 3.5 x 109 J
Que- The average power and instantaneous power become equal if work is done at
a. any rate
b. at variable rate
c. at uniform rate
d. at high rate
Answer- at uniform rate
Que- The relation between horse power and watt is
a. 1 hp = 546 watts
b. 1 hp = 746 watts
c. 1 hp = 1000 watts
d. 1 hp = 946 watts
Answer- 1 hp = 746 watts
Que- Proton electron neutron and a particles have same momentum. Which of them have highest K.E?
a. Proton
b. electron
c. neutron
d. a-particle
Answer- electron
Que- Slope of work time graph is equal to
a. displacement
b. acceleration
c. power
d. energy
Answer- power
Que- Work done by variable force is determine by dividing
a. force into small interval
b. displacement into small interval
c. both force and displacement into small intervals
d. force into small and displacement into large intervals
Answer- displacement into small interval
Que- Work done on the body equals to the
a. change in its K.E always
b. change in its P.E always
c. change in its K.E and change in its P.E
d. neither change in K.E and nor change in its P.E
Answer- change in its K.E and change in its P.E
Que- The escape velocity of a body in gravitational field of earth is independent of
a. its mass
b. the angle at which it is thrown
c. both its mass and the angle at which it is thrown
d. gravitational field of earth
Answer- both its mass and the angle at which it is thrown
Que- The tides raise the mater in the see roughly in a day
a. once
b. twice
c. four time
d. eight time
Answer- twice
Que- The source of geothermal energy is
a. decay of radioactive element in the earth
b. compression of material in the earth
c. residual lost of the earth
d. all as said in a - b and c
Answer- all as said in a - b and c
Que- The highest value of escape velocity in solar system is planet
a. Earth
b. Neptune
c. Jupiter
d. Moon
Answer- Jupiter
Que- Work done by the force of friction is
a. always positive
b. always negative
c. positive only for small frictional force
d. positive only for large frictional force
Answer- always negative
Que- Gravitational P.E of a body has
a. no formula
b. a formula mgh only
c. a formula
d. no general formula
Answer- no general formula
Que- If velocity is doubled then
a. momentum increases 4 times and K.E increases 2 times
b. momentum and K.E. remain same
c. momentum increases 2 times and K.E increases constant
d. momentum increases 2 times and K.E increases 4 time
Answer- momentum increases 2 times and K.E increases 4 time
Que- When the speed of a moving body is doubled then
a. its K.E is doubled
b. its acceleration is doubled
c. its P.E is doubled
d. its momentum is doubled
Answer- its momentum is doubled
Que- One mega watt hour is equal to
a. 36 x 106 J
b. 36 x 1012 J
c. 36 x 109 J
d. 36 x 108 J
Answer- 36 x 108 J
Que- Which of the following is not conservative force
a. friction
b. electric
c. gravitational
d. magnetic
Answer- friction
Que- Work has the dimension as that of same as that of
a. torque
b. angular momentum
c. linear momentum
d. power
Answer- torque
Que- The consumption of energy by a 60 watt bulb in 2 sec is
a. 120 J
b. 60 J
c. 30 J
d. 0.02 J
Answer- 120 J
Que- The escape velocity form the earth surface in km S-1 is
a. 4.2 km S-1
b. 7.5 km S-1
c. 9.5 km S-1
d. 1.1 km S-1
Answer- 1.1 km S-1
Que- If moon radius is 1600 km and g on its surface is 1.6 ms-2 then the escape velocity on the moon is
a. 1600 ms-1
b. 50.6 ms-1
c. 71.6 ms-1
d. 2263ms-1
Answer- 50.6 ms-1
Que- When two protons are brought together
a. Kinetic energy increases
b. P.E. between them increases
c. P.E. between them decreases
d. P.E. between tem does not change
Answer- P.E. between them increases
Que- When arrow is released form its bow, its energy is transformed from
a. heat energy to K.E
b. elastic P.E to K.E
c. elemical energy to elastic P.E
d. K.E to elastic P.E.
Answer- elastic P.E to K.E
Que- A man lifts vertically a weight of 40kg through 1m in 10s; while a chile lifts vertically a weight of 10kg through a distance of 1m in 1s. What will be correct inference?
a. man does more work than child
b. child does more work than man
c. both do the same amount of work
d. it is a foolish question
Answer- child does more work than man
Que- The work done by friction is
a. positive
b. negative
c. zero
d. none of these
Answer- negative
Que- The area under the force displacement graph represents
a. area
b. work done
c. power
d. none of these
Answer- work done
Que- The dimension of power is
a. [ML2T-3]
b. [ML2T-2]
c. [ML2T3]
d. none of these
Answer- [ML2T-3]
Que- Propulsion force of a rocket is
a. non-conservative force
b. conservative force
c. both (a) and (b)
d. non of these
Answer- non-conservative force
Que- The dot product of force and velocity is
a. power
b. work
c. impulse
d. torque
Answer- power
Que- Geothermal energy is a ____________________ source of energy.
a. non-renewable
b. stable
c. renewable
d. none of the above
Answer- renewable
Que- The source of tidal energy is
a. sun
b. earth
c. both (a) and (b)
d. moon
Answer- moon
Que- ________________ cells converts solar energy into electrical energy
a. rotory
b. photovoltaic
c. galvanic
d. non of these
Answer- photovoltaic
Que- On a clear day at noon the solar energy reaching the earth is
a. 1.44kw/m2
b. 1.4kw/m2
c. 1 kw/m2
d. none
Answer- 1 kw/m2
Que- Biomass can be converted into fuels by
a. direct combustion
b. fermentation
c. both (a) and (b)
d. none of these
Answer- both (a) and (b)
Que- The rotational K.E of hoop is equal to the
a. its translational K.E
b. half than its translational K.E
c. double than its translational K.E
d. four times than its translational K.E
Answer- its translational K.E
Que- A hoop and disc have same mass and radius. Their rotational K.E are related by an equation
a. K.Ehoop = K.Edisc
b. K.Ehoop = 2K.Edisc
c. K.Ehoop = 1/2K.Edisc
d. K.Ehoop = 4K.Edisc
Answer- K.Ehoop = 2K.Edisc
Que- The critical speed of an artificial satellite is
a. 8 Kms-1
b. 8.1 Kms-1
c. 7.9 Kms-1
d. 8 ms-1
Answer- 7.9 Kms-1
Que- Geo-stationary satellite completes one rotation around earth in
a. 3 hours
b. 6 hours
c. 12 hours
d. 24 hours
Answer- 24 hours
Que- Radius of geo-stationary orbit from center of earth is nearly
a. 42000km
b. 36000km
c. 24000 km
d. 18000 km
Answer- 42000km
Que- According to Einstein the gravity interaction is possible between
a. material objects only
b. material objects and electromagnetic radiation only
c. electromagnetic radiations
d. none of the above
Answer- material objects and electromagnetic radiation only
Que- One radian is equal to
a. 67.3 Degree
b. 57.3 Degree
c. 87.3 Degree
d. 60 Degree
Answer- 57.3 Degree
Que- The direction of linear velocity of body moving in a circle is
a. along the axis of rotation
b. along the tangent
c. directed towards the center
d. directed away form the center
Answer- along the tangent
Que- When a body moves in a circle, the angle between its linear velocity and angular velocity is always
a. 180 Degree
b. 0 Degree
c. 90 Degree
d. 45 Degree
Answer- 90 Degree
Que- The relation between linear and angular acceleration is
a. a = a x r
b. a = r x a
c. a = a x r
d. r = a x a
Answer- a = a x r
Que- When a body is whirled in a horizontal circle by means of a string the centripetal force is supplied by
a. mass of a body
b. velocity of body
c. tension in the string
d. centripetal acceleration
Answer- tension in the string
Que- Centripetal force performs
a. maximum work
b. minimum work
c. negative work
d. no work
Answer- no work
Que- When a body moves in a circle of radius r with linear speed V its centripetal force is
a. mV/r2
b. mV/r
c. mV2/r
d. mV2/r2
Answer- mV2/r
Que- A stone is whirled in a vertical circle at the end of a string. When the stone is at the highest position the tension in the string is
a. maximum
b. zero
c. equal to the weight of the stone
d. less than the weight of the stone
Answer- equal to the weight of the stone
Que- The span of broad jump depends upon
a. mass of the jumper
b. height of jump
c. angle of projection
d. none
Answer- angle of projection
Que- In case of planets the necessary acceleration is provided by
a. Gravitational force
b. frictional force
c. coulomb force
d. centripetal force
Answer- Gravitational force
Que- If a car moves with a uniform speed of 2 ms-1 in a circle of radius 0.
a. Its angular speed is
b. 4 rad. S-1
c. 5 rad. S-1
d. 1.6 rad. S-1
Answer- 4 rad. S-1
Que- A body can have consutant velocity when it follows a
a. elliptical path
b. circular path
c. parabolic path
d. rectilinear path
Answer- rectilinear path
Que- A cyclist cycling around a circular racing track skids because
a. the centripetal force upon him is less than limiting friction
b. the centripetal force upon him is greater then limiting friction
c. the centripetal force upon him is equal to the limiting friction
d. the friction between the tyres of the cycle and road vanishes
Answer- the centripetal force upon him is greater then limiting friction
Que- What is outward force acting on a mass of 10 kg when rotating at one end an inelastic string 10m long at speed of 1m/s?
a. 1N
b. 10N
c. 2N
d. 100N
Answer- 1N
Que- If we whirl a stone at the end of a string in the vertical circle, it is likely to break when the stone is
a. at the highest point
b. at the lowest point
c. at any point during motion
d. at the point where gravity is not acting
Answer- at the lowest point
Que- A man of weight W is standing on an elevator which is ascending with an acceleration a. The apparent weight of the man is
a. mg
b. mg - ma
c. mg + ma
d. mg - ma
Answer- mg + ma
Que- Who discovered the inverse square law for gravity?
a. Einstein
b. Galileo
c. Newtons
d. Plank
Answer- Newtons
Que- The planet nearest to the earth is
a. Venus
b. Mercury
c. Uranus
d. Sun
Answer- Venus
Que- A satellite moving round the earth constitutes
a. An inertial frome of reference
b. non inertial frame
c. neither inertial nor non inertial
d. both inertial and non inertial
Answer- non inertial frame
Que- Minimum number of communication satellites required to cover the whole carth is
a. 4
b. 3
c. 2
d. 5
Answer- 3
Que- A body of 2 kg is suspended form the ceiling of an elevator moving up with an acceleration g. Its apparent weight in the elevator will be
a. 9.8 N
b. 19.6 N
c. 129.4 N
d. 39.2 N
Answer- 39.2 N
Que- If a body of mass 10 kg is allowed to fall freely, its weight becomes
a. zero
b. 89N
c. 9.8 N
d. 10N
Answer- zero
Que- How many days would be in a year if the distance between the earth and the sun were reduced to half of its present value (assuming circular orbit)?
a. 365 days
b. 730 days
c. 329 days
d. 129 days
Answer- 129 days
Que- When a body is moving along a circular path it covers a certain angle in a given internal of time. Such type of motion is
a. vibratory motion
b. linear motion
c. rotatory motion
d. angular motion
Answer- angular motion
Que- Coefficient of viscosity of honey is greater than
a. milk
b. water
c. tarcoal
d. water
Answer- water
Que- The dimensions of coefficient of visocisity are
a. ML-1T-1
b. M2L1T1
c. ML1T-1
d. M2L-1T-1
Answer- ML-1T-1
Que- Terminal velocity is
a. uniform
b. maximum
c. uniform and maximum
d. neither uniform nor maximum
Answer- uniform and maximum
Que- When body moves with terminal velocity the accereration in the body become
a. zero
b. maximum
c. variable
d. infinite
Answer- zero
Que- Terminal velocity of the body is directly proportional to the
a. radius of the body
b. diameter of the body
c. size of the body
d. square of the diameter of the body
Answer- square of the diameter of the body
Que- The flow of ideal fluid is always
a. turbulent
b. streamline
c. irregular
d. straight line
Answer- streamline
Que- Drag force is given by
a. Newtons law
b. Pascals law
c. Gauss law
d. Stokes law
Answer- Stokes law
Que- When fluid is incompressible then
a. velocity of the fluid is constant
b. flow of the fluid is straight line
c. density of the fluid is constant
d. volume of the fluid is constant
Answer- density of the fluid is constant
Que- Irregular flow of fluid is called
a. streamline
b. turbulent
c. uniform
d. laminar
Answer- turbulent
Que- According to equation of continuity A1V1 = A2V2 = constant. The constant is equal to
a. flow rate
b. volume of fluid
c. mass of fluid
d. density of fluid
Answer- flow rate
Que- Equation of continuity is obtained by apply in law of conservation of
a. mass
b. energy
c. momentum
d. all
Answer- mass
Que- Velocity of fluid increases where the pressure is
a. low
b. high
c. constant
d. changes continuously
Answer- low
Que- Speed of efflux can be determined by applying
a. Bernoulls theorem
b. Torricellis theorem
c. venture relation
d. all
Answer- Torricellis theorem
Que- Blood vessels are
a. rigid
b. not rigid
c. of glass
d. of rubber
Answer- not rigid
Que- Concentration of red cells in blood is about
a. 25%
b. 40%
c. 50%
d. 75%
Answer- 50%
Que- A man standing near a fast moving train may fall
a. on the train
b. away from the train
c. towards the train
d. on himself
Answer- towards the train
Que- For which position maximum blood pressure in the body have the smallest value ?
a. standing straight
b. sitting on chair
c. sitting on ground
d. laying horizontally
Answer- laying horizontally
Que- Two fog droplets have radius 2:3 their terminal velocities are
a. 4:06
b. 4:09
c. 2:09
d. 4.3
Answer- 4:09
Que- Burnoullis equation is obtained by applying law of conservation of _
a. mass
b. energy
c. momentum
d. fluid
Answer- energy