Medical Test 3 - Exam Preparation NEET Notes | EduRev

NEET : Medical Test 3 - Exam Preparation NEET Notes | EduRev

 Page 1


(1)
PHYSICS
Choose the correct answer :
Topics  Covered in Various Subjects :
Physics : Work, Energy and Power; System of Particles and Rotational Motion
Chemistry : States of Matter: Gases & Liquids ; Thermodynamics
Botany : Morphology of Flowering Plants; Anatomy of Flowering Plants
Zoology : Structural Organization in Animals (a) Animal tissues (b) Animal Morphology
MM : 800 Regular Classroom Test - 3 Time : 3 Hrs.
(REGULAR MEDICAL - 201 1)
08/09/2010
Regd. Office : Aakash T ower, Plot No.-4, Sec-11, MLU, Dwarka, New Delhi-110075
Ph.: 011-47623456 Fax : 011-47623472
Premier Institute in India for Medical Entrance Exams.
RM
CODE-A
1. The example of nonzero work is
(1) Work done by a coolie in lifting up a load, against
gravity on a horizontal platform
(2) Work done in holding a heavy weight  by a weight
lifter on his shoulders
(3) Work done by gravitational force in revolution of a
satellite around the earth
(4) All of these
2. A rod of mass 10 kg and length 2 m is lying on a
horizontal table. The minimum work done in making it
stand vertically about one end will be
(1) 200 J
(2) 100 J
(3) 50 J
(4) 400 J
3. Work done by frictional force in pure rolling motion is
(1) Positive
(2) Negative
(3) Positive or negative depends on the condition
(4) Zero
4. A body of mass m tied to a string is moving in complete
vertical circle. The difference in maximum and
minimum tension in the string is
(1) mg (2) 2mg
(3) 3mg (4) 6mg
5. A bob of mass m is attached with a mass less string
of length L as shown in figure. String is hung from a
fixed point. Initial speed of ball is u = 2 gL . T ension
in the string when it becomes horizontal is
m
u
L
(1) mg (2)
2
mg
(3) Zero (4)
3
mg
6. The value of the coefficient of restitution for perfectly
inelastic collision is
(1) Equal to 1 (2) Greater than 1
(3) Zero (4) Less than 1
Page 2


(1)
PHYSICS
Choose the correct answer :
Topics  Covered in Various Subjects :
Physics : Work, Energy and Power; System of Particles and Rotational Motion
Chemistry : States of Matter: Gases & Liquids ; Thermodynamics
Botany : Morphology of Flowering Plants; Anatomy of Flowering Plants
Zoology : Structural Organization in Animals (a) Animal tissues (b) Animal Morphology
MM : 800 Regular Classroom Test - 3 Time : 3 Hrs.
(REGULAR MEDICAL - 201 1)
08/09/2010
Regd. Office : Aakash T ower, Plot No.-4, Sec-11, MLU, Dwarka, New Delhi-110075
Ph.: 011-47623456 Fax : 011-47623472
Premier Institute in India for Medical Entrance Exams.
RM
CODE-A
1. The example of nonzero work is
(1) Work done by a coolie in lifting up a load, against
gravity on a horizontal platform
(2) Work done in holding a heavy weight  by a weight
lifter on his shoulders
(3) Work done by gravitational force in revolution of a
satellite around the earth
(4) All of these
2. A rod of mass 10 kg and length 2 m is lying on a
horizontal table. The minimum work done in making it
stand vertically about one end will be
(1) 200 J
(2) 100 J
(3) 50 J
(4) 400 J
3. Work done by frictional force in pure rolling motion is
(1) Positive
(2) Negative
(3) Positive or negative depends on the condition
(4) Zero
4. A body of mass m tied to a string is moving in complete
vertical circle. The difference in maximum and
minimum tension in the string is
(1) mg (2) 2mg
(3) 3mg (4) 6mg
5. A bob of mass m is attached with a mass less string
of length L as shown in figure. String is hung from a
fixed point. Initial speed of ball is u = 2 gL . T ension
in the string when it becomes horizontal is
m
u
L
(1) mg (2)
2
mg
(3) Zero (4)
3
mg
6. The value of the coefficient of restitution for perfectly
inelastic collision is
(1) Equal to 1 (2) Greater than 1
(3) Zero (4) Less than 1
(2)
7. A ball of mass 3 kg is initially at rest. Due to explosion,
it divides into two parts of 2 kg and 1 kg. If kinetic
energy of heavier part is 8 J, then energy released in
the explosion is
(1) 16 J (2) 24 J
(3) 20 J (4) 32 J
8. An automobile of mass m is accelerates from rest
whose engine supplies a constant power P. The
velocity attained after time t is proportional to
(1) t
3/2
(2) t
1/2
(3) t (4) t
2
9. A ball is dropped from height 32 cm above ground
level. If the coefficient of restitution between the ball
and ground is 0.5 then, to what maximum height will
it rise after first collision?
(1) 16 m (2) 8 m
(3) 4 m (4) 1 m
10. A wire of mass m and length l is bent in the form of an
arc of a circle subtends an angle ? at its centre. Its
moment of inertia (I) about an axis through centre of
circle and normal to the plane of circle varies as
(1) I ? ? (2) I ? ?
–2
(3) (4) I ? ?
0
1 1. A disc is rolling without slipping on a horizontal smooth
surface. Ratio of its translational kinetic energy to total
kinetic energy is
(1) (2)
5
3
(3)
3
2
(4)
7
5
12. A body is rolling down a rough inclined plane. Which
force is responsible for increase in rotational kinetic
energy?
(1) Normal reaction by plane on body
(2) Weight of the body
(3) Frictional force
(4) Gravitational force
13. The F - x graph of a particle of mass 1 kg is shown in
the figure. If the particle begins to move from rest at
x = 0, its velocity at x = 3 is
O
x
F
10 N
3 m 6 m
(1) (2)
(3) (4)
14. Two springs having spring constants K
1
 and K
2
 are
stretched by equal forces. The ratio of respective
potential energies stored in them will be
(1) 1 : 1 (2) K
1
 : K
2
(3) K
2
 : K
1
(4) :
15. A light ball is thrown with a speed of 5 m/s in a gravity
free space and a very heavy lift is moving with a speed
of 10 m/s as shown in the figure. If perfectly elastic
collision takes place between the ball and floor of lift,
then speed of the ball after collision
(1) 15 m/s (2) 25 m/s
(3) 5 m/s (4) 20 m/s
16. Three forces of equal magnitude F act on a moving
body as shown. The body displaces by displacement
S in a duration of t second. The kinetic energy of body
increases by (assuming no other force or field)
F
F
F
S
?
?
?
(1) 3FS (2) 2FS
(3) FS (4) Zero
17. On a foggy day, drivers of two cars spot in front of
each other when 70 m apart. They were travelling at
66 kmph and 60 kmph. Both apply brakes
simultaneously which retard the cars at the rate of
5 m/s
2
 each. Which of the following statements is
correct?
(1) The collision will be averted
(2) The collision will take place
(3) Their relative acceleration is zero
(4) They will just collide
18. A uniform rod AB of length L and mass m is pivoted at
end AB and is released from a horizontal position as
shown in figure. Angular acceleration of rod about A
at this instant is
A B
m, L
(1)
L
g
2
(2)
L
g
2
3
(3)
L
g 3
(4)
L
g
3
2
Page 3


(1)
PHYSICS
Choose the correct answer :
Topics  Covered in Various Subjects :
Physics : Work, Energy and Power; System of Particles and Rotational Motion
Chemistry : States of Matter: Gases & Liquids ; Thermodynamics
Botany : Morphology of Flowering Plants; Anatomy of Flowering Plants
Zoology : Structural Organization in Animals (a) Animal tissues (b) Animal Morphology
MM : 800 Regular Classroom Test - 3 Time : 3 Hrs.
(REGULAR MEDICAL - 201 1)
08/09/2010
Regd. Office : Aakash T ower, Plot No.-4, Sec-11, MLU, Dwarka, New Delhi-110075
Ph.: 011-47623456 Fax : 011-47623472
Premier Institute in India for Medical Entrance Exams.
RM
CODE-A
1. The example of nonzero work is
(1) Work done by a coolie in lifting up a load, against
gravity on a horizontal platform
(2) Work done in holding a heavy weight  by a weight
lifter on his shoulders
(3) Work done by gravitational force in revolution of a
satellite around the earth
(4) All of these
2. A rod of mass 10 kg and length 2 m is lying on a
horizontal table. The minimum work done in making it
stand vertically about one end will be
(1) 200 J
(2) 100 J
(3) 50 J
(4) 400 J
3. Work done by frictional force in pure rolling motion is
(1) Positive
(2) Negative
(3) Positive or negative depends on the condition
(4) Zero
4. A body of mass m tied to a string is moving in complete
vertical circle. The difference in maximum and
minimum tension in the string is
(1) mg (2) 2mg
(3) 3mg (4) 6mg
5. A bob of mass m is attached with a mass less string
of length L as shown in figure. String is hung from a
fixed point. Initial speed of ball is u = 2 gL . T ension
in the string when it becomes horizontal is
m
u
L
(1) mg (2)
2
mg
(3) Zero (4)
3
mg
6. The value of the coefficient of restitution for perfectly
inelastic collision is
(1) Equal to 1 (2) Greater than 1
(3) Zero (4) Less than 1
(2)
7. A ball of mass 3 kg is initially at rest. Due to explosion,
it divides into two parts of 2 kg and 1 kg. If kinetic
energy of heavier part is 8 J, then energy released in
the explosion is
(1) 16 J (2) 24 J
(3) 20 J (4) 32 J
8. An automobile of mass m is accelerates from rest
whose engine supplies a constant power P. The
velocity attained after time t is proportional to
(1) t
3/2
(2) t
1/2
(3) t (4) t
2
9. A ball is dropped from height 32 cm above ground
level. If the coefficient of restitution between the ball
and ground is 0.5 then, to what maximum height will
it rise after first collision?
(1) 16 m (2) 8 m
(3) 4 m (4) 1 m
10. A wire of mass m and length l is bent in the form of an
arc of a circle subtends an angle ? at its centre. Its
moment of inertia (I) about an axis through centre of
circle and normal to the plane of circle varies as
(1) I ? ? (2) I ? ?
–2
(3) (4) I ? ?
0
1 1. A disc is rolling without slipping on a horizontal smooth
surface. Ratio of its translational kinetic energy to total
kinetic energy is
(1) (2)
5
3
(3)
3
2
(4)
7
5
12. A body is rolling down a rough inclined plane. Which
force is responsible for increase in rotational kinetic
energy?
(1) Normal reaction by plane on body
(2) Weight of the body
(3) Frictional force
(4) Gravitational force
13. The F - x graph of a particle of mass 1 kg is shown in
the figure. If the particle begins to move from rest at
x = 0, its velocity at x = 3 is
O
x
F
10 N
3 m 6 m
(1) (2)
(3) (4)
14. Two springs having spring constants K
1
 and K
2
 are
stretched by equal forces. The ratio of respective
potential energies stored in them will be
(1) 1 : 1 (2) K
1
 : K
2
(3) K
2
 : K
1
(4) :
15. A light ball is thrown with a speed of 5 m/s in a gravity
free space and a very heavy lift is moving with a speed
of 10 m/s as shown in the figure. If perfectly elastic
collision takes place between the ball and floor of lift,
then speed of the ball after collision
(1) 15 m/s (2) 25 m/s
(3) 5 m/s (4) 20 m/s
16. Three forces of equal magnitude F act on a moving
body as shown. The body displaces by displacement
S in a duration of t second. The kinetic energy of body
increases by (assuming no other force or field)
F
F
F
S
?
?
?
(1) 3FS (2) 2FS
(3) FS (4) Zero
17. On a foggy day, drivers of two cars spot in front of
each other when 70 m apart. They were travelling at
66 kmph and 60 kmph. Both apply brakes
simultaneously which retard the cars at the rate of
5 m/s
2
 each. Which of the following statements is
correct?
(1) The collision will be averted
(2) The collision will take place
(3) Their relative acceleration is zero
(4) They will just collide
18. A uniform rod AB of length L and mass m is pivoted at
end AB and is released from a horizontal position as
shown in figure. Angular acceleration of rod about A
at this instant is
A B
m, L
(1)
L
g
2
(2)
L
g
2
3
(3)
L
g 3
(4)
L
g
3
2
(3)
19. If a conservative force is acting on a system, then
work done by this force is equal to
(1) Change in kinetic energy
(2) Change in potential energy
(3) Negative of charge in potential energy
(4) Change in mechanical energy
20. In a head on inelastic collision of two balls travelling
in same direction first ball stops after collision. If
coefficient of restitution is 0.8 and velocities of balls
before collision are 10 ms
–1
 and 5 ms
–1
 respectively
then, the velocity of second ball after collision will be
(1) 5 ms
–1
(2) 8 ms
–1
(3) 4 ms
–1
(4) 12 ms
–1
21. A ball of mass 500 g moving with speed 2 m/s collide
to a horizontal floor making an angle of 45° with
vertical. If coefficient of restitution is
1
3
, then the
angle made by the ball with vertical, after collision is
(1) 60° (2) 30°
(3) 45° (4) 37°
22. A small block is released from point A as shown in
the figure. It slides down the smooth surface AB and
leaves contact with the surface at B horizontally. The
horizontal range (R) of this block will be
B
H
R
m
H/2
(1) (2) H
(3) 4 H (4) 2 H
23. A very heavy block collides elastically to a very light
stationary block on a smooth horizontal surface. After
collision the velocity of light body will be
(1) Zero
(2) Same as the velocity of heavy block before
collision
(3) Twice of the velocity of heavy block before collision
(4) Very high as compared to the velocity of heavy
block before collision
24. Parallel axis and perpendicular axes theorems are
respectively applicable for
(1) Thin lamina only, thin lamina only
(2) All bodies, thin lamina only
(3) All bodies, all bodies
(4) Thin lamina only, all bodies
25. Which of the following statement is incorrect?
(1) If external torque on the system about an axis is
zero, then the angular momentum about that axis
is conserved
(2) If external torque on the system about an axis is
zero, then rotational kinetic energy about that
axis is conserved
(3) Any internal interaction between parts of the
system cannot alter its total angular momentum
(4) A particle moving parallel to x-axis or y-axis with
constant velocity, then its angular momentum
about origin will remain constant
26. A uniform rod AB of mass m and length 2a is falling
freely without rotation under gravity with AB horizontal.
Suddenly the end A is fixed when the speed of rod is
v. The angular speed with which the rod begins to
rotate is
(1)
2
v
a
(2)
(3) (4)
27. A disc and a ring of same mass and same radius are
allowed for pure rolling on an rough inclined plane from
same height. Ratio of their acceleration down the plane
is
(1) 4 : 3 (2) 3 : 4
(3) 5 : 2 (4) 2 : 5
28. A diver exhibits some rotations in air before touching
the surface of water. In this case he uses the principle
of
(1) Conservations of linear momentum
(2) Newton’s laws of motion
(3) Conservation of angular momentum
(4) Impulse momentum theorem
29. A body of mass 10 kg is dropped form rest from a
height 20 m. If it reaches the ground with 10 m/s,
then work done by air resistance is
(1) + 1500 J (2) – 1500 J
(3) + 500 J (4) – 500 J
Page 4


(1)
PHYSICS
Choose the correct answer :
Topics  Covered in Various Subjects :
Physics : Work, Energy and Power; System of Particles and Rotational Motion
Chemistry : States of Matter: Gases & Liquids ; Thermodynamics
Botany : Morphology of Flowering Plants; Anatomy of Flowering Plants
Zoology : Structural Organization in Animals (a) Animal tissues (b) Animal Morphology
MM : 800 Regular Classroom Test - 3 Time : 3 Hrs.
(REGULAR MEDICAL - 201 1)
08/09/2010
Regd. Office : Aakash T ower, Plot No.-4, Sec-11, MLU, Dwarka, New Delhi-110075
Ph.: 011-47623456 Fax : 011-47623472
Premier Institute in India for Medical Entrance Exams.
RM
CODE-A
1. The example of nonzero work is
(1) Work done by a coolie in lifting up a load, against
gravity on a horizontal platform
(2) Work done in holding a heavy weight  by a weight
lifter on his shoulders
(3) Work done by gravitational force in revolution of a
satellite around the earth
(4) All of these
2. A rod of mass 10 kg and length 2 m is lying on a
horizontal table. The minimum work done in making it
stand vertically about one end will be
(1) 200 J
(2) 100 J
(3) 50 J
(4) 400 J
3. Work done by frictional force in pure rolling motion is
(1) Positive
(2) Negative
(3) Positive or negative depends on the condition
(4) Zero
4. A body of mass m tied to a string is moving in complete
vertical circle. The difference in maximum and
minimum tension in the string is
(1) mg (2) 2mg
(3) 3mg (4) 6mg
5. A bob of mass m is attached with a mass less string
of length L as shown in figure. String is hung from a
fixed point. Initial speed of ball is u = 2 gL . T ension
in the string when it becomes horizontal is
m
u
L
(1) mg (2)
2
mg
(3) Zero (4)
3
mg
6. The value of the coefficient of restitution for perfectly
inelastic collision is
(1) Equal to 1 (2) Greater than 1
(3) Zero (4) Less than 1
(2)
7. A ball of mass 3 kg is initially at rest. Due to explosion,
it divides into two parts of 2 kg and 1 kg. If kinetic
energy of heavier part is 8 J, then energy released in
the explosion is
(1) 16 J (2) 24 J
(3) 20 J (4) 32 J
8. An automobile of mass m is accelerates from rest
whose engine supplies a constant power P. The
velocity attained after time t is proportional to
(1) t
3/2
(2) t
1/2
(3) t (4) t
2
9. A ball is dropped from height 32 cm above ground
level. If the coefficient of restitution between the ball
and ground is 0.5 then, to what maximum height will
it rise after first collision?
(1) 16 m (2) 8 m
(3) 4 m (4) 1 m
10. A wire of mass m and length l is bent in the form of an
arc of a circle subtends an angle ? at its centre. Its
moment of inertia (I) about an axis through centre of
circle and normal to the plane of circle varies as
(1) I ? ? (2) I ? ?
–2
(3) (4) I ? ?
0
1 1. A disc is rolling without slipping on a horizontal smooth
surface. Ratio of its translational kinetic energy to total
kinetic energy is
(1) (2)
5
3
(3)
3
2
(4)
7
5
12. A body is rolling down a rough inclined plane. Which
force is responsible for increase in rotational kinetic
energy?
(1) Normal reaction by plane on body
(2) Weight of the body
(3) Frictional force
(4) Gravitational force
13. The F - x graph of a particle of mass 1 kg is shown in
the figure. If the particle begins to move from rest at
x = 0, its velocity at x = 3 is
O
x
F
10 N
3 m 6 m
(1) (2)
(3) (4)
14. Two springs having spring constants K
1
 and K
2
 are
stretched by equal forces. The ratio of respective
potential energies stored in them will be
(1) 1 : 1 (2) K
1
 : K
2
(3) K
2
 : K
1
(4) :
15. A light ball is thrown with a speed of 5 m/s in a gravity
free space and a very heavy lift is moving with a speed
of 10 m/s as shown in the figure. If perfectly elastic
collision takes place between the ball and floor of lift,
then speed of the ball after collision
(1) 15 m/s (2) 25 m/s
(3) 5 m/s (4) 20 m/s
16. Three forces of equal magnitude F act on a moving
body as shown. The body displaces by displacement
S in a duration of t second. The kinetic energy of body
increases by (assuming no other force or field)
F
F
F
S
?
?
?
(1) 3FS (2) 2FS
(3) FS (4) Zero
17. On a foggy day, drivers of two cars spot in front of
each other when 70 m apart. They were travelling at
66 kmph and 60 kmph. Both apply brakes
simultaneously which retard the cars at the rate of
5 m/s
2
 each. Which of the following statements is
correct?
(1) The collision will be averted
(2) The collision will take place
(3) Their relative acceleration is zero
(4) They will just collide
18. A uniform rod AB of length L and mass m is pivoted at
end AB and is released from a horizontal position as
shown in figure. Angular acceleration of rod about A
at this instant is
A B
m, L
(1)
L
g
2
(2)
L
g
2
3
(3)
L
g 3
(4)
L
g
3
2
(3)
19. If a conservative force is acting on a system, then
work done by this force is equal to
(1) Change in kinetic energy
(2) Change in potential energy
(3) Negative of charge in potential energy
(4) Change in mechanical energy
20. In a head on inelastic collision of two balls travelling
in same direction first ball stops after collision. If
coefficient of restitution is 0.8 and velocities of balls
before collision are 10 ms
–1
 and 5 ms
–1
 respectively
then, the velocity of second ball after collision will be
(1) 5 ms
–1
(2) 8 ms
–1
(3) 4 ms
–1
(4) 12 ms
–1
21. A ball of mass 500 g moving with speed 2 m/s collide
to a horizontal floor making an angle of 45° with
vertical. If coefficient of restitution is
1
3
, then the
angle made by the ball with vertical, after collision is
(1) 60° (2) 30°
(3) 45° (4) 37°
22. A small block is released from point A as shown in
the figure. It slides down the smooth surface AB and
leaves contact with the surface at B horizontally. The
horizontal range (R) of this block will be
B
H
R
m
H/2
(1) (2) H
(3) 4 H (4) 2 H
23. A very heavy block collides elastically to a very light
stationary block on a smooth horizontal surface. After
collision the velocity of light body will be
(1) Zero
(2) Same as the velocity of heavy block before
collision
(3) Twice of the velocity of heavy block before collision
(4) Very high as compared to the velocity of heavy
block before collision
24. Parallel axis and perpendicular axes theorems are
respectively applicable for
(1) Thin lamina only, thin lamina only
(2) All bodies, thin lamina only
(3) All bodies, all bodies
(4) Thin lamina only, all bodies
25. Which of the following statement is incorrect?
(1) If external torque on the system about an axis is
zero, then the angular momentum about that axis
is conserved
(2) If external torque on the system about an axis is
zero, then rotational kinetic energy about that
axis is conserved
(3) Any internal interaction between parts of the
system cannot alter its total angular momentum
(4) A particle moving parallel to x-axis or y-axis with
constant velocity, then its angular momentum
about origin will remain constant
26. A uniform rod AB of mass m and length 2a is falling
freely without rotation under gravity with AB horizontal.
Suddenly the end A is fixed when the speed of rod is
v. The angular speed with which the rod begins to
rotate is
(1)
2
v
a
(2)
(3) (4)
27. A disc and a ring of same mass and same radius are
allowed for pure rolling on an rough inclined plane from
same height. Ratio of their acceleration down the plane
is
(1) 4 : 3 (2) 3 : 4
(3) 5 : 2 (4) 2 : 5
28. A diver exhibits some rotations in air before touching
the surface of water. In this case he uses the principle
of
(1) Conservations of linear momentum
(2) Newton’s laws of motion
(3) Conservation of angular momentum
(4) Impulse momentum theorem
29. A body of mass 10 kg is dropped form rest from a
height 20 m. If it reaches the ground with 10 m/s,
then work done by air resistance is
(1) + 1500 J (2) – 1500 J
(3) + 500 J (4) – 500 J
(4)
30. A body falling vertically downwards under gravity
breaks in two parts of unequal masses. The centre of
mass of the two parts taken together
(1) Shifts horizontally towards heavier piece
(2) Shifts horizontally towards lighter piece
(3) Does not shift horizontally
(4) Shifts vertically upward
31. Let F
ext
 represents the sum of all external forces acting
on the particles of the system. If F
ext
 = 0, then which
of the following is incorrect?
(1) Acceleration of center of mass must be zero
(2) Velocity of center of mass must be zero
(3) Total momentum of system must be constant
(4) Total kinetic energy of the system may change
32. Two bodies A and B have moment of interia I
1
 and I
2
respectively . If both have same angular momenta, then
their rotational kinetic energies are in the ratio
(1) (2)
(3) (4)
33. A body P moving with momentum  collides with
another body Q moving with momentum . After
collision body P moves with momentum . Now
momentum of body Q becomes
(1)
ˆ
6 j (2)
(3) (4)
34. A string is wrapped around the circumference of a
pulley of radius R. The moment of inertia of the pulley
is I about horizontal axis. A weight Mg is attached to
the end of the string and is released from rest. After
falling through a distance H, the velocity of the wheel
will be
(1) (2)
1
2
2
2
2
??
??
???
MgHR
IMR
(3)
1
2
2
2
4
??
??
???
MgHR
IMR
(4)
1
2
2
2
2( )
??
??
? ??
MgHR
IMR
35. A thin rod of length L and mass m rotates with angular
velocity ? in a horizontal plane about a vertical axis
passing through its one end. Its rotational kinetic
energy is
(1)
22
1
24
mL ? (2)
(3) (4)
36. A particle of mass 1 kg is moving in x-y plane with
velocity  m/s. The angular momentum of the
particle about z-axis, when it is at a point
(3, 4) m is (in SI units)
(1)
ˆ
25 k (2) –
(3) (4) Zero
37. A force ˆ
Fk ?
 acts at O, the origin of the coordinate
system. The torque about the point (2, –2) is
(1) (2) )
ˆ ˆ
( 2 j i F ?
(3) )
ˆ ˆ
( 2 j i F ? ? (4) )
ˆ ˆ
( 2 j i F ?
38. Suppose that due to melting of the polar ice, the
moment of inertia of the earth about its axis of rotation
increases by 1%, then duration of the solar day will
(1) Increase by 14.4 minute
(2) Decrease by 14.4 minute
(3) Increase by 14.4 second
(4) Decrease by 14.4 second
39. A point object of mass m is kept at (a, 0). What mass
should be kept at (–3a, 0), so that centre of mass lies
at origin?
(1) m (2) 2m
(3)
3
m
(4) 3m
40. A uniform circular disc of radius R has its centre at
origin O as shown. If a circular groove of radius R/2 is
made, the coordinates of the centre of mass of the
remaining part is
(1)
?
?
?
?
?
?
0 ,
6
R
(2)
?
?
?
?
?
?
6
, 0
R
(3)
?
?
?
?
?
?
0 ,
3
R
(4)
?
?
?
?
?
?
3
, 0
R
Page 5


(1)
PHYSICS
Choose the correct answer :
Topics  Covered in Various Subjects :
Physics : Work, Energy and Power; System of Particles and Rotational Motion
Chemistry : States of Matter: Gases & Liquids ; Thermodynamics
Botany : Morphology of Flowering Plants; Anatomy of Flowering Plants
Zoology : Structural Organization in Animals (a) Animal tissues (b) Animal Morphology
MM : 800 Regular Classroom Test - 3 Time : 3 Hrs.
(REGULAR MEDICAL - 201 1)
08/09/2010
Regd. Office : Aakash T ower, Plot No.-4, Sec-11, MLU, Dwarka, New Delhi-110075
Ph.: 011-47623456 Fax : 011-47623472
Premier Institute in India for Medical Entrance Exams.
RM
CODE-A
1. The example of nonzero work is
(1) Work done by a coolie in lifting up a load, against
gravity on a horizontal platform
(2) Work done in holding a heavy weight  by a weight
lifter on his shoulders
(3) Work done by gravitational force in revolution of a
satellite around the earth
(4) All of these
2. A rod of mass 10 kg and length 2 m is lying on a
horizontal table. The minimum work done in making it
stand vertically about one end will be
(1) 200 J
(2) 100 J
(3) 50 J
(4) 400 J
3. Work done by frictional force in pure rolling motion is
(1) Positive
(2) Negative
(3) Positive or negative depends on the condition
(4) Zero
4. A body of mass m tied to a string is moving in complete
vertical circle. The difference in maximum and
minimum tension in the string is
(1) mg (2) 2mg
(3) 3mg (4) 6mg
5. A bob of mass m is attached with a mass less string
of length L as shown in figure. String is hung from a
fixed point. Initial speed of ball is u = 2 gL . T ension
in the string when it becomes horizontal is
m
u
L
(1) mg (2)
2
mg
(3) Zero (4)
3
mg
6. The value of the coefficient of restitution for perfectly
inelastic collision is
(1) Equal to 1 (2) Greater than 1
(3) Zero (4) Less than 1
(2)
7. A ball of mass 3 kg is initially at rest. Due to explosion,
it divides into two parts of 2 kg and 1 kg. If kinetic
energy of heavier part is 8 J, then energy released in
the explosion is
(1) 16 J (2) 24 J
(3) 20 J (4) 32 J
8. An automobile of mass m is accelerates from rest
whose engine supplies a constant power P. The
velocity attained after time t is proportional to
(1) t
3/2
(2) t
1/2
(3) t (4) t
2
9. A ball is dropped from height 32 cm above ground
level. If the coefficient of restitution between the ball
and ground is 0.5 then, to what maximum height will
it rise after first collision?
(1) 16 m (2) 8 m
(3) 4 m (4) 1 m
10. A wire of mass m and length l is bent in the form of an
arc of a circle subtends an angle ? at its centre. Its
moment of inertia (I) about an axis through centre of
circle and normal to the plane of circle varies as
(1) I ? ? (2) I ? ?
–2
(3) (4) I ? ?
0
1 1. A disc is rolling without slipping on a horizontal smooth
surface. Ratio of its translational kinetic energy to total
kinetic energy is
(1) (2)
5
3
(3)
3
2
(4)
7
5
12. A body is rolling down a rough inclined plane. Which
force is responsible for increase in rotational kinetic
energy?
(1) Normal reaction by plane on body
(2) Weight of the body
(3) Frictional force
(4) Gravitational force
13. The F - x graph of a particle of mass 1 kg is shown in
the figure. If the particle begins to move from rest at
x = 0, its velocity at x = 3 is
O
x
F
10 N
3 m 6 m
(1) (2)
(3) (4)
14. Two springs having spring constants K
1
 and K
2
 are
stretched by equal forces. The ratio of respective
potential energies stored in them will be
(1) 1 : 1 (2) K
1
 : K
2
(3) K
2
 : K
1
(4) :
15. A light ball is thrown with a speed of 5 m/s in a gravity
free space and a very heavy lift is moving with a speed
of 10 m/s as shown in the figure. If perfectly elastic
collision takes place between the ball and floor of lift,
then speed of the ball after collision
(1) 15 m/s (2) 25 m/s
(3) 5 m/s (4) 20 m/s
16. Three forces of equal magnitude F act on a moving
body as shown. The body displaces by displacement
S in a duration of t second. The kinetic energy of body
increases by (assuming no other force or field)
F
F
F
S
?
?
?
(1) 3FS (2) 2FS
(3) FS (4) Zero
17. On a foggy day, drivers of two cars spot in front of
each other when 70 m apart. They were travelling at
66 kmph and 60 kmph. Both apply brakes
simultaneously which retard the cars at the rate of
5 m/s
2
 each. Which of the following statements is
correct?
(1) The collision will be averted
(2) The collision will take place
(3) Their relative acceleration is zero
(4) They will just collide
18. A uniform rod AB of length L and mass m is pivoted at
end AB and is released from a horizontal position as
shown in figure. Angular acceleration of rod about A
at this instant is
A B
m, L
(1)
L
g
2
(2)
L
g
2
3
(3)
L
g 3
(4)
L
g
3
2
(3)
19. If a conservative force is acting on a system, then
work done by this force is equal to
(1) Change in kinetic energy
(2) Change in potential energy
(3) Negative of charge in potential energy
(4) Change in mechanical energy
20. In a head on inelastic collision of two balls travelling
in same direction first ball stops after collision. If
coefficient of restitution is 0.8 and velocities of balls
before collision are 10 ms
–1
 and 5 ms
–1
 respectively
then, the velocity of second ball after collision will be
(1) 5 ms
–1
(2) 8 ms
–1
(3) 4 ms
–1
(4) 12 ms
–1
21. A ball of mass 500 g moving with speed 2 m/s collide
to a horizontal floor making an angle of 45° with
vertical. If coefficient of restitution is
1
3
, then the
angle made by the ball with vertical, after collision is
(1) 60° (2) 30°
(3) 45° (4) 37°
22. A small block is released from point A as shown in
the figure. It slides down the smooth surface AB and
leaves contact with the surface at B horizontally. The
horizontal range (R) of this block will be
B
H
R
m
H/2
(1) (2) H
(3) 4 H (4) 2 H
23. A very heavy block collides elastically to a very light
stationary block on a smooth horizontal surface. After
collision the velocity of light body will be
(1) Zero
(2) Same as the velocity of heavy block before
collision
(3) Twice of the velocity of heavy block before collision
(4) Very high as compared to the velocity of heavy
block before collision
24. Parallel axis and perpendicular axes theorems are
respectively applicable for
(1) Thin lamina only, thin lamina only
(2) All bodies, thin lamina only
(3) All bodies, all bodies
(4) Thin lamina only, all bodies
25. Which of the following statement is incorrect?
(1) If external torque on the system about an axis is
zero, then the angular momentum about that axis
is conserved
(2) If external torque on the system about an axis is
zero, then rotational kinetic energy about that
axis is conserved
(3) Any internal interaction between parts of the
system cannot alter its total angular momentum
(4) A particle moving parallel to x-axis or y-axis with
constant velocity, then its angular momentum
about origin will remain constant
26. A uniform rod AB of mass m and length 2a is falling
freely without rotation under gravity with AB horizontal.
Suddenly the end A is fixed when the speed of rod is
v. The angular speed with which the rod begins to
rotate is
(1)
2
v
a
(2)
(3) (4)
27. A disc and a ring of same mass and same radius are
allowed for pure rolling on an rough inclined plane from
same height. Ratio of their acceleration down the plane
is
(1) 4 : 3 (2) 3 : 4
(3) 5 : 2 (4) 2 : 5
28. A diver exhibits some rotations in air before touching
the surface of water. In this case he uses the principle
of
(1) Conservations of linear momentum
(2) Newton’s laws of motion
(3) Conservation of angular momentum
(4) Impulse momentum theorem
29. A body of mass 10 kg is dropped form rest from a
height 20 m. If it reaches the ground with 10 m/s,
then work done by air resistance is
(1) + 1500 J (2) – 1500 J
(3) + 500 J (4) – 500 J
(4)
30. A body falling vertically downwards under gravity
breaks in two parts of unequal masses. The centre of
mass of the two parts taken together
(1) Shifts horizontally towards heavier piece
(2) Shifts horizontally towards lighter piece
(3) Does not shift horizontally
(4) Shifts vertically upward
31. Let F
ext
 represents the sum of all external forces acting
on the particles of the system. If F
ext
 = 0, then which
of the following is incorrect?
(1) Acceleration of center of mass must be zero
(2) Velocity of center of mass must be zero
(3) Total momentum of system must be constant
(4) Total kinetic energy of the system may change
32. Two bodies A and B have moment of interia I
1
 and I
2
respectively . If both have same angular momenta, then
their rotational kinetic energies are in the ratio
(1) (2)
(3) (4)
33. A body P moving with momentum  collides with
another body Q moving with momentum . After
collision body P moves with momentum . Now
momentum of body Q becomes
(1)
ˆ
6 j (2)
(3) (4)
34. A string is wrapped around the circumference of a
pulley of radius R. The moment of inertia of the pulley
is I about horizontal axis. A weight Mg is attached to
the end of the string and is released from rest. After
falling through a distance H, the velocity of the wheel
will be
(1) (2)
1
2
2
2
2
??
??
???
MgHR
IMR
(3)
1
2
2
2
4
??
??
???
MgHR
IMR
(4)
1
2
2
2
2( )
??
??
? ??
MgHR
IMR
35. A thin rod of length L and mass m rotates with angular
velocity ? in a horizontal plane about a vertical axis
passing through its one end. Its rotational kinetic
energy is
(1)
22
1
24
mL ? (2)
(3) (4)
36. A particle of mass 1 kg is moving in x-y plane with
velocity  m/s. The angular momentum of the
particle about z-axis, when it is at a point
(3, 4) m is (in SI units)
(1)
ˆ
25 k (2) –
(3) (4) Zero
37. A force ˆ
Fk ?
 acts at O, the origin of the coordinate
system. The torque about the point (2, –2) is
(1) (2) )
ˆ ˆ
( 2 j i F ?
(3) )
ˆ ˆ
( 2 j i F ? ? (4) )
ˆ ˆ
( 2 j i F ?
38. Suppose that due to melting of the polar ice, the
moment of inertia of the earth about its axis of rotation
increases by 1%, then duration of the solar day will
(1) Increase by 14.4 minute
(2) Decrease by 14.4 minute
(3) Increase by 14.4 second
(4) Decrease by 14.4 second
39. A point object of mass m is kept at (a, 0). What mass
should be kept at (–3a, 0), so that centre of mass lies
at origin?
(1) m (2) 2m
(3)
3
m
(4) 3m
40. A uniform circular disc of radius R has its centre at
origin O as shown. If a circular groove of radius R/2 is
made, the coordinates of the centre of mass of the
remaining part is
(1)
?
?
?
?
?
?
0 ,
6
R
(2)
?
?
?
?
?
?
6
, 0
R
(3)
?
?
?
?
?
?
0 ,
3
R
(4)
?
?
?
?
?
?
3
, 0
R
(5)
41. An uniform ring is released on a horizontal rough
surface with horizontal velocity of centre of mass V
0
and angular velocity about centre of horizontal mass
zero. The velocity of its centre of mass, when it starts
pure rolling is
(1)
2
0
V
(2)
3
2
0
V
(3)
5
3
0
V
(4)
7
5
0
V
42. A man of mass 50 kg is standing on a horizontal planck
of mass 150 kg placed on a horizontal frictionless
plane. Initially both are at rest. If the man starts moving
to right with speed 4 m/s w.r.t the planck, then the
velocity of the planck is
frictionless
(1) 1 m/s to left
(2) 1 m/s to right
(3) 3 m/s to left
(4) 3 m/s to right
43. Three identical thin rods each of mass m and
length l are joined to form a letter H. The moment of
inertia of the system about one of the sides of H is
(1)
2
4
3
ml
(2)
2
1
3
ml
(3)
2
7
5
ml
(4)
2
5
3
ml
44. A thin uniform rod of mass M and length L is inclined
at an angle ? to OO' as shown in figure. The moment
of inertia of the rod about the axis OO' is
O O ?
?
(1)
2
1
12
ML
(2)
22
1
 sin
3
ML ?
(3)
22
1
 cos
3
ML ?
(4) ML
2
 sin
2
?
45. A thin uniform rod AB of mass M and length L is kept
vertical on a rough horizontal plane. If it is allowed to
fall without slipping at A, then its angular velocity just
before hitting the ground is
B
M, L
A
(1)
L
g
(2)
L
g 2
(3)
L
g 3
(4)
L
g
3
In the following questions (46 to 50), a statement
of assertion (A) is followed by a statement of
reason (R).
(1) If both Assertion & Reason are true and the reason
is the correct explanation of the assertion, then
mark (1).
(2) If both Assertion & Reason are true but the reason
is not the correct explanation of the assertion,
then mark (2).
(3) If Assertion is true statement but Reason is false,
then mark (3).
(4) If both Assertion and Reason are false
statements, then mark (4).
46. A : The change in kinetic energy of a body is equal
to work done by only external forces acting on it.
R : The internal forces acting on a system cannot
change its kinetic energy.
47. A : A body with negative total energy can have
momentum.
R : Momentum cannot be negative.
48. A : The work done by centripetal force is always zero
in a circular path.
R : Centripetal force cannot change magnitude of
velocity and hence kinetic energy remain constant.
49. A : If a body is in rotational equilibrium, then its
angular momentum about any axis is conserved.
R : If a body is in rotational equilibrium, then torque
on its about any axis is zero.
50. A : Work done by friction force in pure rolling motion
may be zero.
R : The friction force acting in pure rolling motion of a
rigid body is static friction.
Read More
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