Total Questions:50 Total Time: 75 Min
Remaining:
Question:A body is vibrating in simple harmonic motion with an amplitude of 0.06 m and frequency of 15 Hz. The maximum velocity and acceleration of the body is :
9.80 m/s and 9.03 x 10\(^2\) m/s\(^2\)
8.90 m/s and 8.21 x 10\(^2\) m/s\(^2\)
6.82 m/s and 7.62 x 10\(^2\) m/s\(^2\)
5.65 m/s and 5.32 x 10\(^2\) m/s\(^2\)
Question:Kinetic energy of an electron accelerated in a potential difference of 100 V is :
1.6 x 10\(^{ - 34}\)J
1.6 x 10\(^{ - 29}\)J
1.6 x 10\(^{ - 21}\)J
1.6 x 10\(^{ - 17}\)J
Question:If the equation of motion of standing wave is y = 0.3sin(314t - 1.57x). Then the velocity of standing wave is :
400 unit
250 unit
200 unit
150 unit
Question:On producing the waves of frequency 1000 Hz in a Kundt's tube, the total distance between 6 successive nodes is 85 cm. Speed of sound in the gas filled in the tube is :
300 m/s
350 m/s
340 m/s
330 m/s
Question:A particle executes simple harmonic motion of amplitude A. At what distance from the mean position its kinetic energy is equal to its potential energy ?
0.81 A
0.71 A
0.61 A
0.51 A
Question:Diamagnetic substances are :
strongly repelled by magnets
feebly repelled by magnets
feebly attracted by magnets
strongly attracted by magnets
Question:The study of the effects associated with electric field at rest is known as :
electrostatics
electromagnetism
magnetostatics
none of these
Question:For driving current of 2A for 6 min in a I circuit, 1000J of work is to be done. The emf of the source in the circuit is :
1.38 V
1.68 V
2.03 V
3.10 V
Question:A current carrying wire in the neighbourhood I produces :
electric and magnetic fields
magnetic field only
no field
electric field
Question:A resonance air column of length 20 cm resonates with a tuning fork of frequency 250 Hz. The speed of the air is :
75 m/s
150 m/s
200 m/s
Question:An iron rod of length 2m and cross-sectional area of 50 mm2 is stretched by 0.5 mm, when a mass of 250 kg is hung from its lower end. Young's modulus of iron rod is :
19.6 x 10\(^{20}\) N/m\(^2\)
19.6 x 10\(^{18}\) N/m\(^2\)
19.6 x 10\(^{10}\) N/m\(^2\)
19.6 x 10\(^{15}\) N/m\(^2\)
Question:Two parallel wires in free space are 10 cm apart and each carries a current of 10 A in the same direction. The force exerted by one wire on other per metre of length of the wire is:
2 x 10\(^{ - 6}\)N
2 x 10\(^{ - 4}\)N
2 x 10\(^{ - 3}\)N
2 x 10\(^{ - 2}\)N
Question:A wire has resistance of 3.1 Q at 30\(^\circ \)C and resistance 4.5 Q at 100\(^\circ \)C. The temperature coefficient of resistance of the wire is:
0.0012\(^\circ \) C\(^{ - 1}\)
0.0024\(^\circ \) C\(^{ - 1}\)
0.0032\(^\circ \) C\(^{ - 1}\)
0.0064\(^\circ \) C\(^{ - 1}\)
Question:If the current through 3\(\Omega \) resistor is 0.8 A, then potential drop through 4\(\Omega \) resistor is :
1.2 V
2.6 V
4.8 V
9.6 V
Question:The direction of the null points is on the equatorial line of a bar magnet, when the north pole of the magnet is pointing to :
West
East
South
North
Question:Two batteries of emf 4V and 8V having the internal resistance of 1\(\Omega \) and 2\(\Omega \) respectively are connected in circuit with a resistance of 9fi as shown in a figure. The current and potential difference between the points P and Q are :
\(\frac{1}{{12}}\)A and 12V
\(\frac{1}{9}\) A and 9V
\(\frac{1}{6}\) A and 4V
\(\frac{1}{3}\) A and 3V
Question:The dimensions of gravitational constant G are :
\(\left[ {{\rm{M}}{{\rm{L}}^{{\rm{ -3}}}}{{\rm{T}}^{{\rm{ - 2}}}}} \right]\)
\(\left[ {{{\rm{M}}^{{\rm{ - 1}}}}{{\rm{L}}^{\rm{2}}}{{\rm{T}}^{{\rm{ - 2}}}}} \right]\)
\(\left[ {{\rm{M}}{{\rm{L}}^{{\rm{ - 2}}}}{{\rm{T}}^{\rm{2}}}} \right]\)
\([{M^{ - 1}}{L^3}{T^{ - 2}}]\)
Question:A 30 g bullet initially travelling at 120 m/s penetrates 12 cm into wooden block. The average resistance exerted by the wooden block is:
1800 N
2000 N
2200 N
2850 N
Question:A bar magnet of magnetic moment 200 A-m\(^2\) is suspended in a magnetic field of intensity 0.25 N/Am the couple required to deflect it through 30\(^0\) is :
15 N-m
20 N-m
25 N-m
50 N-m
Question:Two magnets each of magnetic moment M are placed so as to form a cross at right angles to each other. The magnetic moment of the system will be :
M
0.5M
\(\sqrt 2 \)M
2M
Question:Plate current will be maximum when :
both the grid and anode are negative
both the grid and anode are positive
grid is positive and anode is negative
grid is negative and anode is positive
Question:Sodium has body centered packing. Distance between two nearest atoms is 3.7\(\mathop A\limits^{\,\,\,0} \) . The lattice parameter is :
4.9\(\mathop A\limits^{\,\,\,0} \)
4.3\(\mathop A\limits^{\,\,\,0} \)
3.8\(\mathop A\limits^{\,\,\,0} \)
3.4 \(\mathop A\limits^{\,\,\,0} \)
Question:A long hollow copper pipe carries a current, then magnetic field produced is :
both inside and outside the pipe
neither inside nor outside the pipe
outside the pipe only
inside the pipe only
Question:Which of the following are not the transverse waves ?
Sound waves
Visible light waves
X-rays
y-rays
Question:The displacement x of a particle moving along a straight line at time t is given by \(x = {a_0} + {a_1}t + {a_2}{t^2}\). The acceleration of the particle is:
4a\(_2\)
2a\(_2\)
2a\(_1\)
a\(_2\)
Question:A bomb is dropped from an aeroplane moving horizontally at constant speed. If air resistance is taken into consideration, then the bomb :
falls on earth exactly below the aeroplane
falls on the earth exactly behind the aeroplane
falls on the earths ahead of the aeroplane
flies with the aeroplane
Question:In a p-type semiconductor germanium is doped with :
aluminium
boron
gallium
all of these
Question:In a triode valve, the current in the plate circuit is controlled by :
ammeter
grid
cathode
anode
Question:When a bus suddenly takes a turn, the passengers are thrown outwards because of:
speed of motion
inertia of motion
acceleration of motion
none of the above
Question:The logic behind NOR gate is that which gives
high output when both inputs are high
low output when both inputs are low
high output when both inputs are low
Question:Which of the following statements is not correct ?
Infra-red photons have more energy than photons of visible light
Infra-red rays are invisible but can cast shadows like visible light
Photographic plates are sensitive to ultraviolet rays
Photographic plates are sensitive to infrared rays
Question:In which sequence the radioactive radiations are emitted in the following nuclear reaction ? \(_Z{X^A}{ \to _{Z + 1}}{Y^A}{ \to _{Z - 1}}{K^{A - 4}}{ \to _{Z - 1}}{K^{A - 4}}\)
\(\gamma ,\alpha \) and \(\beta \)
\(\alpha \), \(\beta \) and \(\gamma \)
\(\beta \), \(\alpha \) and \(\gamma \)
\(\beta \), \(\gamma \) and \(\alpha \)
Question:If red light and violet light rays are of focal lengths \({f_R}\) and \({f_v}\), then which one of the following is true ?
\({\lambda _R} \le {\lambda _v}\)
\({\mu _R} > {\mu _v}\)
\({\lambda _R} = {\lambda _v}\)
\({\mu _R} < {\mu _v}\)
Question:The large scale destruction, that would be caused due to the use of nuclear weapons is known as :
neutron reproduction factor
nuclear holocaust
thermonuclear reaction
Question:If in Ramsden's eyepiece, the field lenses have focal lengths \({f_1}\) and \({f_2}\) respectively and separated by a distance d then :
\({f_1}\) = \(3{f_2}\) and d = \({f_1}\) + \({f_2}\)
\({f_1}\) = \({f_2}\) and d= \(\frac{2}{3}{f_1}\)
\({f_1}\) = \(\frac{2}{3}\) and d = \(\frac{2}{3}{f_1}\)
\({f_1}\) = \({f_2}\) and d = \({f_1}\) + \({f_2}\)
Question:Huygen's wave theory of light could not explain :
photoelectric effect
polarization
diffraction
interference
Question:The rain drops are spherical in shape due to :
residual pressure
thrust on drop
surface tension
viscosity
Question:The work done in pulling up a block of wood weighing 2 kN for a length of 10m on a smooth plane inclined at an angle of 15 \(^0\) with the horizontal is :
9.82 k J
8.91 k J
5.17 k J
4.36 k J
Question:The thermions are :
positrons
photons
electrons
protons
Question:The internal resistance of cell of emf 2V is 0.1 \(\Omega \). It is connected to a resistance of 3.9ft. The voltage across the cell is:
2.71V
1.95 V
0.52 V
Question:The earth of mass 6 x 10\(^{{\rm{24}}}\) kg revolves around the sum with an angular velocity of 2 x 10\(^{ - 7}\) rad/s. In a circular orbit of radius 1.5 x 10\(^8\) km, the force exerted by the sun, on the earth is :
27 x 10\(^{39}\) N
36 x 10\(^{21}\) N
18 x 10\(^{25}\) N
6 x 10\(^{19}\) N
Question:A stone is thrown with an initial speed of 4.9 m/s from a bridge in vertically upward direction. It falls down in water after 2 s. The height of the bridge is :
24.7 m
19.8 m
9.8 m
4.9 m
Question:A ball of mass 150g moving with an acceleration 20 m/s\(^2\) is hit by a force, which acts, on it for 0.1 s. The impulsive force is :
1.2 Ns
0.3 Ns
0.1 Ns
0.5 Ns
Question:If the heat of 110 J is added to a gaseous system, whose internal energy is 40 J, then the amount of external work done is:
80 J
70 J
115 J
140 J
Question:The substance in which the magnetic moment of a single atom is not zero, is called as :
ferrimagnetism
paramagnetism
ferromagnetism
diamagnetism
Question:The luminous efficiency of a lamp is 4 lumen/W and its luminous intensity is 30 cd. The power of lamp is :
60 W
78 W
94 W
136 W
Question:The work function of aluminium is 4.2 eV. If two photons each of energy 3.5 eV strike an electron of aluminium, then emission of electron :
depended upon the density of the surface
data is incomplete
is not possible
is possible
Question:Two vectors \(\vec A\) and \(\vec B\) are such that A + B = C and \({A^2} + {\rm{ }}{B^2} = {{\rm{C}}^{\rm{2}}}\). If 6 is the angle between \(\vec A\) and \(\vec B\)then the correct statement is :
\(\theta = \pi \)
\(\theta = \frac{{2\pi }}{3}\)
\(\theta = 0\)
\(\theta = \frac{\pi }{2}\)
Question:A rough vertical board has an acceleration a along the horizontal so that a block of mass M pressing against it does not fall. The coefficient of friction between block and the board is :
\( > \frac{a}{g}\)
\( < \frac{g}{a}\)
\( = \frac{a}{g}\)
Question:An aeroplane is moving with a horizontal velocity u at a height h. The velocity of packet dropped from it on the earth's surface will be :
\(\sqrt {{u^2} - 2gh} \)
\({2gh}\)
\(\sqrt {2gh} \)
\(\sqrt {{u^2} + 2gh} \)