10th Science Unit 1 Important One Marks

10th Science Unit 1 Important One Marks 

I.  Choose the correct answer:



1.  Inertia of a body depends on
a)  weight of the object
b)  ) acceleratioi due to gravity of the planet
c) mass of the object
d) Both a & b
2.  Impulse is equals to
a)  rate of change of momentum
b)   rate of force and time
c) change of momentum
d) rate of change of mass
3.  Newton’s III law is applicable
a)  for a body is at rest
b)  for a body in motion
c) both a & b
d) only for bodies with equal masses
4.  Plotting a graph for momentum on the X-axis and time on Y—axis. slope of momentum time graph gives
a)  Impulsive force
b)   Acceleration
c) Force
d) Rate of force
5.  In which of the following sport the turning effect of force used?
a)  swimming
b)   tennis
c) cycling
d) hockey
6.  The unit of’g’ is ms-2. It can be also expressed as
a)  cm s-1
b)  N kg-1
c) N m2 kg-1
d) cm2s-2
7.  One kilogram force equals to
a) 9.8 dyne                                                  b) 9.8x104 N
c) 98 x 104 dyne                                         d) 980 dyne
8.  The mass of a body is measured on planet Earth as M kg. When it is taken to a planet of radius half that of the Earth then its value will be                  kg
a)  4 M                    
b)  2 M
c)   M/4
d) M 
 9.  If the Earth shrinks to 50% of its real radius its mass remaining the same, the weig of a body on the Earth will
a)  decrease by 50%
b)   increase by 50%
c) decrease by 25%
d) increase by 300%
10.  To project the rockets which ofthe following principle(s) is /(are) required?
a)  Newton’s third law of motion
b)   Newton’s law of gravitation
c) law of conservation of linear momenm
d) both a and c
12.                 deals with the bodies which are at rest under the action of forces.
a)   Statics
b)   Kinematics
c) Dynamics
d) Mechanics
13.Study of moving bodies under the action of forces                     
a)  Statics
b)   Kinematics
c) Dynamics
d) Mechanics

14.  The resistance of a body to change its state of rest is called
a)   inertia of rest
b)   inertia of motion
c) momentum
d) inertia of direction
15.  The resistance of a body to change its state of motion is called
a)  force
b)   momentum
c) inertia of motion
d) inertia of direction
16.  The resistance of a body to change its direction of motion is
a)  force
b)   momentum
c) inertia of motion
d) inertia of direction
17.  Mixing sugar in a glass of milk using a spoon is                            
a)  force
b)   momentum
c) inertia of motion
d) inertia of direction
18.  The act of cleaning a carpet by heiting it with a stick is an example for ineriia of
a)  motion
b)  direction
c) rest
d) momentum
19.  A luggage is usually tied with a rope on the roof of the buses due to
a)   Inertia of motion
b)   inertia of direction
c) inertia of rest
d) momentum 
20.  The momentum of a heavy object at rest will be
a)  large
b)   infinity
c) zero
d) small



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