WorksheetsOPEN BOOK TEST
Total questions: 25
Worksheet time: 13mins
The length of a body is measured as 3.51 m, if the accuracy is 0.01m, then the percentage error in the measurement is
a) 351%
b) 1%
c) 0.28%
d) 0.035%
The density of a material in CGS system of units is 4g/cm . In a system of units in which unit of length is 10 cm and unit of mass is 100 g, the value of density of material will be
a) 0.4
b) 40
c) 400
d) 0.04
Which of the following pairs of physical quantities have the same dimension?
a) force and power
b) torque and energy
c) torque and power
d) force and torque
Which one of the following physical quantities cannot be represented by a scalar?
a) Mass
b) length
c) momentum
d) magnitude of acceleration
Force acting on the particle moving with constant speed is
a) always zero
b) need not be zero
c) always non zero
d) cannot be concluded
If a particle executes uniform circular motion in the xy plane in clock wise direction, then the angular velocity is in
a) +Y direction
b) +Z direction
c) -Z direction
d) -X direction
The dimensional formula of Planck's constant h is
a) [ML2T -1 ]
b) [ML2T -3 ]
c) [MLT-1]
d) [ML3T-3 ]
Light year is
a) light emitted by the sun in one year.
b) time taken by light to travel from sun to earth.
c) the distance travelled by light in free space in one year.
d) time taken by earth to go once around the sun.
The dimensional formula for relative density is
a) [M L-3 ]
b) [M0 L-3]
c) [M0L0 T-1 ]
d) [M0 L0 T0 ]
Illuminance of a surface is measured in
a) Lumen
b) candela
c) lux
d) lux m
A particle has moved from one position to another position
a) its distance is zero
b) its displacement is zero
c) neither distance nor displacement is zero
d) average velocity is zero
The vector sum of the forces of 10 N and 6 N can be
a) 2 N
b) 8 N
c) 18 N
d) 20 N
A missile is fired for maximum range with an initial velocity of 20 m/s. If g = 10 m/s , the range of the missile is
a) 40 m
b) 50 m
c) 60 m
d) 20 m
The law which is valid in both inertial and non-inertial frame is
a) Newton's first law
b) Newton's second law
c) Newton's third law
d) none
A force of 10 N acts on a body of mass 20 kg for 10 seconds. Change in its momentum is
a) 5 kg m/s
b) 100 kg m/s
c) 200 kg m/s
d) 1000 kg m/s
A body of mass 2 kg is placed on a horizontal surface having kinetic friction 0.4 and static friction 0.5. If the force applied on the body is 2.5 N, then the frictional force acting on the body will be [g = 10 ms -2]
a) 8 N
b) 10 N
c) 20 N
d) 2.5 N
A body is thrown upwards and reaches its maximum height. At that position
a) its acceleration is minimum
b) its velocity is zero and its acceleration is also zero
c) its velocity is zero but its acceleration is maximum
d) its velocity is zero and its acceleration is the acceleration due to gravity
The slope of the velocity time graph for retarded motion is
a) positive
b) negative
c) zero
d) can be +ve, –ve or zero
When a car takes a sudden left turn in the curved road, passengers are pushed towards the right due to
a) inertia of direction
b) inertia of motion
c) inertia of rest
d) absence of inertia
The time of flight of a projectile on an upward inclined plane depends upon
a) angle of inclination of the plane
b) angle of projection
c) the value of acceleration due to gravity
d) all of the above
Given that A + B = R and A2 + B2 = R2 . The angle between A and B is
a) 0
b) π /4
c) π /2
d) π
If force is the cause then the effect is
a) mass
b) potential energy
c) acceleration
d) Inertia
A block of mass m is placed on a smooth wedge of inclination . 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 (g is acceleration due to gravity) will be
a) mg/cos θ
b) mg cos θ
c) mg sin θ
d) mg
A ball is projected vertically upwards with a velocity v. It comes back to ground in time t. Which v-t graph shows the motion correctly?
Random error can be eliminated by
a) careful observation
b) eliminating the cause
c) measuring the quantity with more than one
d) taking large number of observations and then
instrument their mean
