The SPARK Institute of Language & Sciences
Physics-I
CHAPTER 06
TEST 6.1
1.
Tick the correct laws which are dimensionally equal
(a) work-power-energy
(b) power-joule-plank’s constant
(c) work-force-speed
(d) work-torque-energy
2.
Which of the following is not satellite of solar system?
A. Jupiter
B. Sun
C. Mars
D. Earth
E. except B
3.
The direction of the gravitational force is;
A. along the line joining the centers of masses
B. perpendicular the line joining the centers of masses
C. towards the centre of each mass
D. perpendicular to the plane of masses
E. both A & C
4.
Two masses A and B are placed at certain distance such that body is thrice as heavier
than B. The gravitational force applied by heavy body on lighter is 14N then force of
attraction of lighter body on heavier is ______________.
A. 14 N
B. 42 N
C. 4.33 N
D. 17 N
E. zero
5.
The moment of inertia of earth is maximum at;
A. equator
B. poles
C. centre
D. everywhere
E. none of these
6.
If Earth is to be considered as rotating in circular path around sun rather than its
oval type path then;
I. There is no variations occurs in seasons.
II. There can be more than four seasons.
III. The acceleration due to gravity of earth becomes infinity.
A. I & II only
B. I & III only C. I only
D. II & III only
E. I, II & III only
7.
A planet X rotates around a massive body Y as natural equilibrium then;
I. planet X acts as satellite where as planet Y acts as star.
II. planet X acts as star where as planet Y acts as satellite.
III. the gravitational force between X and Y is equal in magnitude to that of
centripetal force.
A. I & II only
B. I & III only C. III only
D. II & III only
E. I, II & III only
8.
If Jupiter rotates around Sun with the centripetal force of F Newton then
gravitational force between Jupiter and Sun is _______ Newton when the
orbital radius of Jupiter is R.
A. F
B. ½ F R
C. ¼ FR
D. ¾ F R2
E. F/R
9.
The ratio of acceleration due to gravity of earth at altitude of h i-e ‘gh’ to that of
acceleration on surface ‘g’ is mathematically expressed as; (RE = radius of earth)
 1 

h 
1


A. 
B.
C. 1 
2
RE 
h  RE 
 h  RE 


2h 

D. 1 
RE 

Engr. Harish Kumar

2h 

E. 1 
RE 

2
The SPARK Institute of Language & Sciences
Physics-I
CHAPTER 06
TEST 6.1
10.
The ratio of acceleration due to gravity of earth at altitude of h i-e ‘gh’ to that of
acceleration on surface ‘g’ is;
A. unity or one
B. zero
C. more than unity or one
D. equal to 1
E. less than 1
11.
The acceleration due to gravity of earth under depth d i-e ‘gd’ is mathematically
expressed as; (RE = radius of earth)



1
d
d 


A. 
B.
C.
1

2

g  RE 2
RE 
 g d  RE 

2
12.
13.
14.
15.
16.
17.
18.


gd 
2d 


D.  g 
E.  g 
RE 
RE 


If anybody is thrown vertically upward in the absence of air friction from earth
surface so that it reaches to the height of 3190Km. The velocity of projection of
body is;
A. 11200 km/s
B. 11200 cm/s
C. 11.2 m/s D. 11200 m/s E. 11.2 cm/s
When anybody moves away from surface of earth the variation in acceleration due to
gravity occurs at fast rate at/in;
A. altitude or height
B. depth
C. latitude of earth
D. same variation in either direction
Tick the correct statement(s).
I. It is difficult to walk on surface of moon due to large normal reaction of
surface.
II. it is difficult to walk on surface of moon due to small normal reaction of surface
than that of earth.
III. It is difficult to walk on Jupiter due to less normal reaction of surface than earth
IV. It is difficult to walk on Jupiter due to large normal reaction of surface than earth
A. I, II & III only
B. I & III only
C. II & IV only
D. I, II & IV only
E. II, III & IV only
Which of the following laws are analogues?
A. Newton’s laws of motion & universal law of gravitation
B. Coulomb’s Law & Newton’s universal law of gravitation
C. Coulomb’s laws & Newton’s Laws of motion D. Stokes law and Universal law
The gravitational force between two masses is F Newton. If their masses are increased
by x times while their separation is reduced to x. The gravitational force between the
masses becomes ___________ Newton.
A. x2F
B. x4F
C. 1/x4F
D. F
E. 1/x2 F
The state where apparent weight of body becomes zero is called as;
A. weightlessness
B. free fall state
C. motion under gravity
D. all of these
Direction (18-21): A body of 10kg mass is suspended by means of spring balance at the
roof of elevator. (g= 10m/s2)
If elevator is ascending with uniform acceleration of 2m/s 2 then spring balance
measures weight of body as;
A. 100 N
B. 120 N
C. 20 N
D. zero
E. 80 N
Engr. Harish Kumar
The SPARK Institute of Language & Sciences
Physics-I
CHAPTER 06
TEST 6.1
19.
If elevator is descending with uniform velocity of 2m/s then spring balance
measures weight of body as;
A. 100 N
B. 120 N
C. 20 N
D. zero
E. 80 N
20.
If elevator is moving under the action of gravity then spring balance measures weight
of body as;
A. 100 N
B. 120 N
C. 20 N
D. zero
E. 80 N
21.
Tick the correct statement(s);
I. An elevator is said to be in weightlessness.
II. The bodies lies in an elevator are said to be in weightlessness.
III. the elevator is not in weightlessness but every object inside it are in
weightlessness.
A. III only
B. I & III only C. I & II
D. II & III only
E. I, II & III
22.
The weightlessness can be recovered by;
A. spinning the body around its own axis.
B. spinning the frame of reference of body around it own axis
C. artificial gravity
D. Both B & C
23.
A person while standing in an elevator drops an apple. If elevator is moving under the
action of gravity then he observes that;
A. an apple is ascending with some acceleration.
B. an apple is at rest (stationary)
C. an apple is descending to the floor of an elevator.
D. all of these
24.
If the mass of body moves towards the axis of rotation, its moment of inertia:
a) Increases
b) Decreases c) Remained constant d) None of the above
25.
A body of 23 kg mass is suspended by means of spring balance at the roof of elevator,
If elevator is ascending with uniform acceleration of 2m/s 2 then mass of body
becomes;
A. increases B. becomes zero
C. decreases D. remains unchanged
26.
The gravitational acceleration changes with altitude h according to the formula:
a) gh = g - 2g/Re
b) gh = 2g - h/Re
c) gh = 2g – 2gh/Re
d) gh = g - 2gh/Re
27.
tick the correct for gravity of planet;
a) it decreases with density
b) it increases with density
c) it decreases with the mass of planet
d) all of these
28.
The gravitational force between two bodies is _______, _______ pair:
a) Normal and general
b) Positive and negative
c) Negative and positive
d) Action and reaction
29.
An astronaut, in a satellite, orbiting the earth, experience a state of weightlessness
because of:
a) The satellite orbits the earth at a very large speed
b) The satellite orbits the earth with a centripetal acceleration greater than ‘g’
c) The satellite orbits the earth with a centripetal acceleration less than ‘g’
d) The satellite orbits the earth with a centripetal acceleration equal to ‘g’
30.
Gravitational mass, when multiplied by ____ gives measure of gravity of the earth:
a) Inertial mass
b) Mass of earth
c) G
d) g
Engr. Harish Kumar
The SPARK Institute of Language & Sciences
Physics-I
CHAPTER 06
TEST 6.1
31.
Practically the inertial mass and the gravitational mass are:
a) Additive inverse of each other
b) Multiplicative inverse of each other
c) Equal
d) Not equal
32.
When a lift is moving upward with a uniform velocity, the apparent weight of a body
inside the lift will be:
a) Equal to its actual weight
b) Less than the actual weight
c) More than the actual weight
d) Zero
33.
When the lift is moving upward with a uniform acceleration, the apparent weight of
the body inside it will be:
a) Less than its actual weight
b) More than its actual weight
c) Varying with velocity
d) The same as its actual weight
34.
When the lift moves upward with a uniform acceleration “a”, the apparent value of g
inside the lift changes to:
a) g + a
b) g - a
c) g – 2a
d) g + 2a
35.
When the lift moves downward with a uniform acceleration, the apparent weight of
the body inside the lift will be:
a) Less than its actual weight
b) More than its actual weight
c) Varying with its velocity
d) The same as its actual weight
36.
When the lift moves downward with an acceleration “a”, the apparent value of “g”
inside the lift changes to:
a) g + a
b) g – a
c) g – 2a
d) g + 2a
37.
The astronauts in a satellite experience a state of weightlessness because both the
astronaut and the satellite fall toward the earth with an acceleration of:
a) g
b) 2g
c) 3g
d) -g
38.
In a spaceship, artificial gravity is created with the help of:
a) Centripetal force b) Centrifugal force c) Magnetic force d) None of the above
39.
How the artificial gravity is created in a satellite to overcome the state of
weightlessness experienced by the astronaut in it?
a) By increasing the orbital speed of the satellite
b) By decreasing the orbital speed of satellite
c) By keeping the orbital speed of the satellite constant equal to that of the earth’s
around sun
d) By causing the satellite to spin about its own axis
40.
_______ force is responsible for the motion of the planets around the sun:
a) Gravitation
b) Weak
c) Strong
d) None of these
1
2
3
4
5
6
7
8
9
10
11
12
13
14
D
B
E
A
A
C
B
A
D
E
D
D
A
C
15
16
17
18
19
20
21
22
23
24
25
26
27
28
B
B
D
B
A
D
C
D
B
B
D
D
B
D
29
30
31
32
33
34
35
36
37
38
39
40
C
D
C
A
B
A
A
B
A
A
D
A
Engr. Harish Kumar