Download Physics MCQs part 1 2007

2007
1ai) Kitabul manazir was written by




Ibn-ul-Haitham
Al Beruni
Ibn-e-sina
Al Razi
ii) The area of a parellogram form by two vectors Ā and B is given by




½ (A.B)
|AxB|
½ |AxB|
(A.B)
iii) When a constant force is applied on a body, it moves with




Constant speed
Constant velocity
Constant acceleration
None
2ai) Centripetal force is also called




Centrifugal force
Tangential force
Centre-seeking force
None
ii) The rate of change of angular momentum with respect to time is




Force
Angular acceleration
Angular velocity
Torque
iii)The apparent weight of a body in a satellite orbiting around the earth is
 Zero
 Decreasing
 Increasing
 None
3ai) The dot product of force and velocity is




Work
Energy
Power
momentum
ii) The basic unit of luminous intensity is




W/m2
Dioptre
Decibel
Candella
iii) A vector which can be displaced parallel to itself and is applied at any point is known
as ______ vector




Null
Position
Unit
Free
4ai) The dimension of linear momentum are




MLT-1
MLT2
ML2T-1
M2L2T-2
ii) Stroke’s law of fluid friction is given as




F = 6𝜋η2v
F = 4𝜋η rv
F = 6𝝅η rv
F = 𝜋η rv
iii) The work done by a conservative force along closed path is




Postive
Zero
Negative
None
5ai) Decibel is the unit of




Wave length
Intensity level
Speed of wave
Frequency
ii) the speed of sound is the highest in




Solid
Gas
Liquid
Vacum
iii) The voice of two person having the same pitch and loudness can be recognized due to
the characteristics of the sound known as




Beats
Frequency
Quality
Intensity
6ai) The pitch if the sound depends on




Frequency
Intensity
Wave length
Velocity
ii) If the mass of a body suspended from a spring is doubled, the period of vibration of the
body becomes




Double
Half
2 times-2
Fout times
iii) The maximum number of beat that can be detected by human ear is




3
5
7
9
7ai) Wave front near the point source is




Plane
Spherical
Cylindrical
Conical
ii) Chromatic aberration can be reduced by using a combination of




Two converging lenses
Two diverging lenses
A converging lens and dicerging lens of different material
None
iii) The phenomenon of light which proves that light waves are trasnverse is




Reflection
Interference
Refraction
Polarization
8ai) The conditions of interference on a thin lens in reversed because of




Difraction
Refraction
Phase coherent
Phase reversal
ii) Difraction of x-rays can be studied by using




A thin film
Rock salt
Difractin grating
None
iii) Two convex lenses of same focal length ‘f’ are combined together. The focal length of
the combined lens is


2f
2+ f
* f/2
*2 – f
2008
1ai) The author of the book Al-Shifa was




Al Razi
Abu Rehman AL-Beruni
Ibn-e-Sina
Ibn-ul-Haitham
ii) Two perpendicular vectors having magnitude of 4 units and 3 units are added. There
resultant has the magnitude




7 units
12 units
25 units
5 units
iii) The dimensions of torque are




ML2T
ML2T-2
ML2T2
MLT-2
2ai) The number of significant figures in 0.005040 is




3
4
5
6
ii) An angle subtended at its centre by an ARC whose length is equal to its radius is




37.3°
47.3°
57.3°
67.3°
iii) The centre of a mass of a system of particules




Always coincided with the centre of gravity
Never coincided with the centre of gravity
Coincides with the centre of gravity in a uniform gravitational field
Coincides with the centre of gravity in a non uniform gravitational field
3ai) Two projectile A and B are thrown up with the same speed at an angle of 60° and
30° respectively with the horizontal, then




The range of ‘A’ will be greater
The range of ‘B’ will be greater
The range of A and B will be same
The range is independant of the angles
ii) Which of the following is a spin motion?




The motion of the planets round the sun
The motion of electron round the nucleus
The motion of the moon round the earth
The daily rotation of the earth causing day and night
iii) If we go up from the surface of the earthto a distance equal to radius of the earth,
the calue of ‘g’ will be




½g
¼g
2g
4g
4ai) The work done by the centripetal force ‘F’ on a body moving in a circle is zero
because




The body moving parallel to F
The body moves opposite to F
The body moves at right angle to F
The centripetal and centrifugal force balance each other
ii) In an elastic collision of two bodies




K.E is conserved only
Momentum is conserved only
Bothe K.E and momentum are conserved
Neither K.E nor momentum is conserved
iii) A body moving along a circular path with an increasing speed possesses




Tangential acceleration only
Centripetal acceleration only
Both tangential and centripetal acceleration
No acceleration
5ai) The frequency of simple pendulum is given by
𝑔

f= 2𝜋 √ 𝐿

f= 2𝜋 √𝑔

f=1/2𝜋 √𝑔

f= 1/2𝜋 √ 𝒍
𝐿
𝐿
𝒈
ii) Beats are produced due to




diffraction
interference
Polarization
Refraction
iii) When the temperature of air rises, the speed of the sound sound waves increases
because




The frequency of the wave increases
The wavelength of the wave increases
Both the frequency and wavelength increases
Neither frequency nor wavelength increases
6ai) If you go in increases the stretching force on wire in a guitar, its frequecy of
vibration




Increases
Decreases
Neither increase or decreases
Becones zero
ii) If the mass of a body suspended from a spring is increase to 4 times, the period of
vibration of the body will be




4 times
2 times
√2 times
Same as before
iii) If the fundamental frequency of vibration of a string fixed at both ends is 50 Hz,
the fourth harmonic will be


100 Hz
150 Hz


200 Hz
250 Hz
7ai) The power of a concave lens of focallength 50 cm is




0.5 dioptre
-0.5 dioptre
2 dioptres
-2 dioptres
ii) the trasverse nature of light was confirmed by




Interefence
Difraction
Polarization
Dispersion
iii) The conditions for the constructive and the destructive interference are reversed in
case of thin films due to




Phase reversal of one part of a wave
Phase reversal of both parts of wave
Phase reversal of non
Change on frequency of non
8ai) In Galilean telescope the final image formed is




Real and inverted
Real and erect
Virtual and inverted
Virual and erect
ii) In case of far-sightedness the image of an object is formed




On the retina
In front of the retina
Behind the retina
At the last distance of the distinct vision
iii) Yellow light from a sodium lamp is sed to form Newton’s ring. The central spot in
Newton’s ring will be




Yellow
Bright
Dark
Neither bright nor dark
2009
1 i) Screw and lever were invented by




Newton
AL-Farabi
Archimedes
Galileo galilei
ii) If a vector is divided by its own magnitude the resulting vector is called




Position vector
Unit vector
Null vector
Free vector
iii) If a light object collides elastically with a massive body which is at rest, the light
object will




Rebound with the same velocity
Be stopped
Rebound with twice the velocity
Cause the massive body to move
iv) The angular momentum of a particle is conserved if the




Net torque acting on the particle is zero
Net force acting on the particle is zero
The acceleration of the particle is zero
Net displacement of the particle is zero
v) A bod executes simple harmonic motion if


a = kx
v = -kx


a = -√𝒌𝒙
a = -kx2
vi) The dimensions of the kinetic energy are




½ ML2T-2
ML2T-2
1/2 ML2T2
MLT-2
vii) Two perpendicular vectors having magnitudes of 4 units and 3 units are added.
The resultant has the magnitude of




7 units
13 units
25 units
5 units
viii) The S.I unit of intensity of sound is




Watt/m2
Decibel
Weber
Dioptre
xi) A projectile is thrown at an angle of 30° with horizontal having a certain initial
velocity. It will have the same range if thrown with the same velocity as before at an
angle of




45°
60°
75°
15°
x) The rate of change of angular momentum is also called




Acceleration
Force
Torque
Power
xi) A man goes up to a height from earth’s surface equal to the radius of the earth. His
weight relative to the earth’s surface would




Become half
Become double
Remain the same
Become one-fourth
xii) If two tuning forks with frequencies 256 Hz and 262 Hz are sounded together, the
beats frequency will be




3
4
5
6
xiii) Two convex lenses of the same focal length ‘f’ are kept in contact with each
other. The focal lenght of the combined lens will be




2f
f/g
2
F
xiv) The number of significant figures in 2.500 x 103




2
3
4
7
xv) If the tension of a stretched is increased 4 times, the speed of the transverse wave
in it will increase




4 times
8 times
2 times
16 times
xvi) If 𝑖.̂ 𝑗̂ and 𝑘̂ are the unit vectors along x, y and z axes respectively, then
𝑘̂ X 𝑗̂ =




𝑖̂
-𝒊̂
1
-1
xvii) The velocity of sound has maximum value in




Solids
Liquids
Gases
Free space
2010
i)



⃗⃗ = 0 and 𝐴⃗ x 𝐵
⃗⃗ =0 and A ≠ 0 , then vector B is
If 𝐴⃗ . 𝐵
Equal to 𝐴⃗

Zero
Perpendicular to 𝐴⃗
Parallel to 𝐴⃗




The number of significant figure of 7.050x10-2 is
2
3
4
6




Kitabul-Manazir is written by
Ibn-e-sina
Ibn-ul-Haitham
Al-Razi
Al-Beruni




The dimension of angular momentum is
L2M2T2
L2M2T
L2MT
L2MT-1




Torque is defined as the time rate of change of
Angular momentum
Linear momentum
Angular velocity
Angular acceleration




Stoke’s law holds good for
The bodies of all shapes
Motion through non-viscous medium
Motion through vaccum
Motion through viscous medium
ii)
iii)
iv)
v)
vi)
vii)




How many metre(s) will a 20kg ball, starting from rest, fall freely in one
second?
19.6 m
9.8 m
4.0 m
4.9 m
viii)




The horizontal range of a projectile depends upon
The angle of projection
The velocity of the projectile
‘g’ at the place
All of them
ix)




If we go up from the surface of the earth to a distance equal to the radius of
earth, the value of ‘g’ will become
One-fourth
One-eight
One-ninth
Double




When a body moves vertically upward, the work done will be
Positive
Negative
Zero
Maximun




By using adjustable aperture of a lens we can reduce the defect of the lens
which is called
Astigmatism
Chromatic aberration
Spherical aberration
None of them




Pitch depends upon
Frequency
Loudness
Time period
Distance
x)
xi)
xii)
xiii)


Which of the following does not exhibit simple harmonic motion?
A hanging spring supporting a weight
The balance wheel of a watch


The wheel of an automobile
The string of a violin
xiv)




The velocity of sound in space is
332 m/sec
344 m/sec
330 m/sec
Zero
xv)
A cyclist cycling around a circular racing tracks skids because
The centripetal force upon him is less than the limiting friction
The centripetal force upon him is greater than the limiting friction
The centripetal force upon him is equal to the limiting friction
None of these




xvi)




xvii)




In Young’s double-slit experiment, the condition for the constuctive
interference is that the path difference must be
An odd multiple of the half wavelength
An odd multiple of the whole wavelength
An integral multiple of the wavelength
An even number of the wavelength
If the power of a converging lens is 4 dioptres what is the focal length of the
lens?
20 cm
25cm
10 cm
50 cm
2011
i)




This is compressional wave
Light wave
Sound wave
Radio wave
X-Rays




If two turning forks of frequencies 256 Hz and 260 Hz are sounded together,
the number of beats per second will be
3
4
5
6
ii)
iii)



⃗⃗ = 0 and 𝐴⃗ x 𝐵
⃗⃗ = 0 and A ≠ 0, then vector 𝐵
⃗⃗ is
If 𝐴⃗.𝐵
Equal to 𝐴⃗

Zero
Perpendicular to 𝐴⃗
Parallel to 𝐴⃗




The rate of change of angular momentum with respect to time is
Force
Angular velocity
Angular acceleration
Torque




Two forces equal in magnitude but opposite in direction and not acting on the
same line constitue
A couple
Power
A circle
A force




The acceleration of a body moving down a frictionless plane inclined at 30°
will be
4.9 m/s2
9.3 m/s2
98 m/s2
10 m/s2
iv)
v)
vi)
vii)




The work done by a conservative force along a closed path is
Positive
Negative
Zero
None of these
viii)




The dimension of G is
M-2L-2T3
ML-2T3
M-1L3T-2
M-2L2T2
ix)




If one moves up from the surface of the earth to a distance equal to the radius
of the earth the value of acceleration due to gravity will be
½g
¼g
2g
4g




Earthquake waves are the example of
Audio waves
Infrasonic waves
Ultrasonic waves
Shock waves




The wave theory of light cannot explain
Polarization
Photoelectric effect
Interference
Diffraction




The magnifying power of a lens of focal length 25cm is
½
1
Zero
2
x)
xi)
xii)
xiii)




Light year is the unit of
Time
Energy
Intensity
Distance
xiv)




A one kilogram stone: falling freely from a height of 10 metres, strikes the
ground with a velocity of
14 m/s
10 m/s
98m/s
19.6 m/s




When the angular velocity of a disk increases, angular acceleration 𝒶 and
angular velocity 𝓌 are
Parallel
Non parallel
Perpendicular
None of these
xv)
xvi)




xvii)




If the speed of moving body is halved, kinetic energy becomes
One fourth
Half
Three times
Four times
Electromagnetic waves consist of oscillating electric and magnetic fields, both
are
Parallel to each other
Perpendicular to each other
Non parallel to each other
None of these