The
frequencies of two tuning forks are 480 cps and 480.05 cps respectively.
When sounded together, after how much interval the maximum sound will
become half if the minimum intensity is zero ?

5 s
10 s
20 s
0.025 s

2.

A traveling
wave passes a point of observation where in the time interval between
two successive crests in found to be 0.2 s. Then

the wave length of the wave is 5 m
the frequency of the wave is 5 cps
the velocity of the wave is 5 m/s
all the above

3.

Ultrasonic
waves are those waves

to which human ear in sensitive
are of high velocity
are of high amplitude
none of these

4.

The
Laplace's correction for the expression for the velocity of sound
given by Newton was needed because the sound waves

are Longitudinal
propagate adiabatically
propagate isothermally
have long wave lengths

5.

When
two waves having constant phase difference produce interference, then
there is

loss of energy
gain in energy
redistribution of energy which does not depend
on time
redistribution of energy which depends on time

6.

The
equation of a wave traveling on a string is given by y = 10 sin /2 (8t
- x/8); where x and y are in cms. The velocity of the wave is

32 cms in the negative x-direction
32 cms in the positive x-direction
64 cms in the negative x-direction
64 cms in the positive x-direction

7.

Equation
of a progressive wave is given by
y = 0.2 cos (0.04t
+ 0.02x -/6);
where the distances are expressed in centimeter and time in second.
The minimum distance between two particles having a phase difference
of /2
is

4 cm
8 cm
25 cm
1.25 cm

8.

By
the principle of superposition, the resultant displacement in equal
to the

sum of the two displacements produced by two
waves
vector sum of the two displacements produced
by two waves
the difference between the two displacements produced
by two waves
none of these

9.

The
work done by the string of a simple pendulum during one complete oscillation
is equal to the

Total energy of the pendulum
KE of the pendulum
Pe of the pendulum
Zero

10.

Which
of the following is a necessary and sufficient condition for simple
harmonic motion?

Proportionality between restoring force and the
displacement from the equilibrium
position.
Constant period
Constant acceleration
All of the above

11.

Two
charges 4q and q are kept "x" m apart. At what distance must be another
charge "e" must be placed from the charge q, so that it is in equilibrium
?

x/3
x/2
x/4
2x/3

12.

A meatalic
sphere has charge of 10 nC. A unit negative charge is moved from a
point A to a point B, both I m away from the centre of the sphere,
A being on the east side B being on the west side. The total work
done is

-2/10J
-1/10J
zero
cannot be calculated

13.

The
distance between two point charges 25 µC and 36 µC is
0.11m. At what point on the line joining the two charges in the intensity
be zero ?

At a distance of 0.05 m from 36 µC charge
At a distance of 0.05 m from 25 µC charge
At a distance of 0.11 m from 36 µC charge
At a distance of 0.11 m from 25 µC charge

14.

If
a glass rod is rubbed with silk, it acquires positive charge. This
is because

protons are added to it
electrons are added to it
electrons are removed from it
either (a) or (c)

15

The
pressure-temperature relationship for an ideal gas undergoing adiabatic
change is

The
horizontal range of a particle thrown along a direction making an
angle of 45degrees with the horizontal is equal to

the vertical light
twice the vertical light
four times the vertical light
half the vertical light

17.

A body
is thrown vertically upwards. If air resistance is not taken into
account, then the time of ascent is

equal to the time of descent
greater than the time of descent
less than the time of descent
twice the time of descent

18.

A stationary
observer feels greater pitch of a sound while moving towards the source.
The reason for this is

increase in the pitch of the source
decrease in the wave length of the sound waves
increse in the velocity of sound
increase in the wave length of the sound waves

19.

A
blowing whistle is turned rapidly on a horizontal circle. A man standing
outside the circle will be

not hear it
listens uniform sound
listens one maxima and one minima
listens two maxima two one minima

20.

When
a light source is approaching an observer

wavelength of light decreases
wavelength of light increases
wavelength of light remains unaltered
velocity of light increases

21.

An
ammeter gives a full scale definition for a current of 1A. To convert
it into a 10A range ammeter, the ratio of its resistance and shunt
resistance will be

1 : 9
10 : 1
9 : 1
1 : 10

22.

Two
unequal resistances are connected in parallel. Which of the following
statement is correct ?

The current through both in the same
The voltage drop across each is the same
The current through the higher resistance is high
None of these

23.

A cell
of emf E is connected across an external resistance R. If the terminal
p.d., across the cell is V volts, the internal resistance of the cell
is given by

(E - V) R / V
(E - V) R / E
(V - E) R / V
(V - E) R / E

24.

There
are n similar conductors each of resistance R. When connected in parallel,
the equivalent resistance is "x". When connected in series, the equivalent
resistance will be

x/n
nx
n^{2}x
x/n^{2}

25.

Given
three equal resistors, how many different combinations of all the
three can be made ?

4
6
8
3

26.

An
infinite number of resistors are connected as shown in the figure.
If R_{1} = 1 and R_{2} = 2 the equivalent resistance across the terminals AB is

Infinity
2
1
1.5

27.

If
the length of a potentiometer wire is increased, then the balancing
length previously obtained will

increase
decrease
remain unchanged
becomes two times

28.

A current I flows through an infinitely long straight conductor. If "r" is the
perpendicular distance of a point from the wire, then the magnetic
induction B varies with "r" as

B r^{0}
B r^{ -1}
Br^{ -2}
B r ^{-3}

29.

The
field due to a long straight wire carrying a current I is proportional to

I
I ^{3 }

1 / I

30.

For
a paramagnetic material the dependence of the magnetic susceptibility x on the absolute temperature T is given by

x T
x 1/T
x e^{T}
x is constant

31.

Which
of the following statement is true in the case of electric lines of
force ?

They are always parallel to one another
In a non-uniform electric field, the lines of force
interest each other
They are always perpendicular to each another
They are always terminate at negative charges.

32.

A variable
capacitor and an electroscope are connected in parallel to a battery.
The reading of the electroscope would be decreased by

increasing the area of the overlap plates of the
capacitor
placing a pile of paraffin wax between the plates
of capacitor
decreasing the distance between the plates
decreasing the battery potential

33.

A parallel
plate capacitor has a capacitance of 50 µF with air as dielectric
and 110 µF with an oil as a dielectric. The dielectric constant
of the oil is

2.2
1.1
0.5
1

34.

A parallel
plate capacitor has a capacitance of 10 µF with air as dielectric.
The area of the capacitor is divided into two equal halves and filled
with two media having dielectric constants 2 and 4. The capacitance
of the system will now be

10 µF
30 µF
5 µF
20 µF

35.

The
capacity of a spherical conductor of radius R is given by

R / 4
4 /
R
4 R
1 / 4 R

36.

. An
infinite number of capacitors each of capacitance 1µF are connected
to parallel branch contains 2^{n} capacitors connected in
series where n=0, 1, 2, 3, 4,.. The equivalent capacitance of the
combination is equal to

1µF
2µF
0.5µF
infinity

37.

The
value of a resistance with a colour code yellow, violet and gold is

47± 5 % 4.7 ± 5 % 4.7 ± 20 % 0.47 ± 5

38.

A current
of 4.8 A is flowing through a conductor. The number of electrons passing
per second across a point is

3 X 10 ^{19}
7.68 X 10 ^{20}
3 X 10 ^{20}
7.68 X 10 ^{19}

39.

The
specific resistance of a material is
0.5 µ-m.
The resistance of a cube of length
0.5 m of the material will be

.05 10 ^{-3 } 10 ^{-5} 10 ^{-6}^{}

40.

Four resistance 10 ,
2,
5 and 25 are connected in cyclic order in the form of a Wheatstone's bridge.
A current of 1.4 A enters at the junction of 10 and 25 resistors. The current through the 2 resistor is

1 A
1.2 A
1.4 A
none of these

41.

For
a telescope to have a large resolving power, the

focal length of its objective should be large
focal length of its eye-piece should be large
focal length of its objective should be small
aperture of its objective should be large

42

A
light wave has a frequency of 4x10 ^{14 }Hz and a wavelength
of 5x10^{-7} metres in a medium. The refractive index of the
medium is

1.5
1.33
1.6
2.4

43.

A person
sees his virtual image by holding a mirror very close to his face.
When he moves the mirror away from his face, the image becomes inverted.
What type of mirror is he using ?

Plane mirror
Convex mirror
Concave mirror
None of these

44.

In
electromagnetic radiations

magnetic field remains unchanged while electric
field changes with time
electric field remains unchanged while electric
field changes with time
both electric and magnetic fields are time dependant
neither electric nor magnetic fields are time dependant

45.

An
inductance of 1 mH, a capacitor of 10µF and a resistance of
50 are
connected in series. The reactances of inductor and capacitor are
same. The reactance of either of them will be

100
50
30
10

46.

The
power factor in a circuit connected to an ac power supply has a value
which is

unity when the circuit contains an ideal capacitor
only
unity when the circuit contains an ideal resistance
only
unity when the circuit contains an ideal inductance
only
zero when the circuit contains an ideal resistance
only

47.

In
a transformer the core is made up of soft iron to reduce

hysteresis loss
eddy current loss
magnetic flux linkage
all the above

48.

A coil
and bulb are connected in series with a de source. When a soft core
is inserted into the coil,

intensity of the bulb decreases
intensity of the bulb increases
intensity of the bulb remains unchanged
the bulb ceases to glow

49.

In
a transformer, the coefficient of mutual induction between the primary
and secondary coil is 0.2 H. When a current changes by 5 amperes/second,
the emf induced in the secondary is

1V
5V
20 V
15V

50.

A rod
of length 0.4 m moves in a direction perpendicular to a magnetic field
of strength
1.2 T. The emf induced in the moving rod is 2.4 V. What is the speed
of the rod ?

0.5 m/s
2.5 m/s
7.5 m/s
5 m/s

51.

The
objective of a telescope has a focal length of 1.2 m and diameter
0.05 m. The focal length of the eye-piece is 0.05m. The magnifying
power of the telescope for distant object is

10
24
60
100

52.

The
momentum of a photon is 3.3 *10 ^{-29 }kg-m/s. Its frequency
will be

The
de Broglie wavelength of a mass 1 kg moving with a speed of 1 m/s
is

6.6 x10 ^{-34} m
6 x10^{-34} m
6.6x10 ^{-10 }m
6x 10 ^{-10} m

54.

Which
experiment indicates that the whole positive charge of an atom is
concentrated in the nucleus of size10^{ -14} m ?

Madam Curie's experiment with
radioactivity
Rutherford's experiment on µ-ray
scattering
Faraday's experiment on electrolysis
Thomson's experiment to determine
the specific charge
of electron

55.

The
half life period of radium is 1600 years. Its average life time is

1600 years
1/1600 years
2319 years
1/2319 years

56.

In
the reaction _{92} U ^{235} + _{0} n1-->_{51}Xe ^{140} + _{z }Sr^{A} + 2 _{0} n^{1} + photon the values of Z and A are

38, 94
39, 94
38, 95
41, 94

57.

The
energy required to knock out the electron in the third orbit of a
hydrogen atom is equal to

13.6 eV
+ 13.6/9 eV
+ 13.6/3 eV
none
of these.

58.

When
the electrical conductivity of a semiconductor is due to the breaking
up of its covalent bonds only, then the semiconductor ids said to
be

a p-type semiconductor
a n-type semiconductor
an intrinsic semiconductor
a extrinsic semiconductor

59.

Electron,
proton, neutron and -particle
are moving with equal velocity. Which one of them will have the smallest
wave length ?

Electron
Proton
Neutron
a-particle

60.

Fusion
reaction takes place at very high temperatures because

atoms are ionized at high temperatures
KE is high enough to overcome the electrostatic
force of repulsion
Molecules break up at high temperatures
All the above