Download neet test paper 08 - Sigma Physics Centre

PHYSICS
NEET TEST PAPER
08
1.The test is of 1 hour duration.
2.The Test Booklet consists of 30 questions. The maximum marks are 120.
3.There is one part in the question paper. The distribution of marks is as under for each correct response.
Physics (120 marks) – Question No. 1 to 30 consist of FOUR (4) marks each for correct response. (-1) mark will be awarded
for each wrong response.
1.
A coil having n turns and resistance R Ω is connected with a
galvanometer of resistance 4R Ω. This combination is moved
in time t seconds from a magnetic field W1 weber to W2
weber. The induced current in the circuit is :
W2  W1
5Rnt
(W2  W1 )
(c) 
Rnt
(a)
2.
n (W2  W1 )
5 Rt
n (W2  W1 )
(d) 
Rt
(d) is the same for all metals and independent of the intensity
of the radiation
6.
from this substance is approximately :
(a) 540 nm
(b) 400 nm
(b) 
(c) 310 nm
7.
(a) 3.3 x 10-18 C
(c) 1.6 x 10-18 C
circuit R, the mean power generated per period of rotation is :
3.
(b)
( Br 2 ) 2
8R
(c)
( Br ) 2
2R
(d)
( Br 2 ) 2
8R
4.
8.
(d) L/4
horizontal component of earth’s magnetic field is 0.2 x 10 -4 T,
then the emf developed be tween the two ends of the
5.
(c) 5 mV
(d) 50 mV
According to Einstein’s photoelectric equation, the plot of the
kinetic energy of the emitted photoelectrons from a metal Vs
the frequency, of the incident radiation gives a straight line
whose slope :
(a) depends on the nature of the metal used
(b) depends on the intensity of the radiation
(c) depends both on the intensity of the radiation and the
metal used
A nucleus disintegrates into two nuclear parts which have
their velocities in the ratio 2 : 1. The ratio of their nuclear
(c) 3
9.
1/2
(b) 1 : 31/2
(d) 1 : 21/3
:1
The binding energy per nucleon of deuteron
helium nucleus
A metal conductor of length 1 m rotates vertically about one
of its ends at angular velocity 5 radians per second. If the
conductor is :
(a) 5 μV
(b) 50 μV
(b) 3.2 x 10-18 C
(d) 4.8 x 10-18 C
sizes will be :
(a) 21/3 : 1
In an LCR circuit, capacitance is changed from C to 2C. For
the resonant frequency to remain unchanged, the inductance
should be changed from L to :
(a) 4L
(b) 2L
(c) L/2
A charged oil drop is suspended in uniform field of 3 x 104
10 m/s2)
circle with angular frequency ω. If the total resistance of the
Br 2
2R
(d) 220 nm
V/m so that it neither falls nor rises. The charge on the drop
will be :(take the mass of the charge = 9.9 x 10 -15 kg and g =
In a uniform magnetic field of induction B, a wire in the form
of semicircle of radius r rotates about the diameter of the
(a)
The work function of a substance is 4.0 eV. The longest
wavelength of light that can cause photoelectron emission

4
2

 
2
1
and
 e is 1.1 MeV and 7 MeV respectively.
If two deuteron nuclei react to from a single helium nucleus,
then the energy released is :
(a) 13.9 MeV
(b) 26.9 MeV
(c) 23.6 MeV
(d) 19.2 MeV
10. An α-particle of energy 5 MeV is scattered through 1800 by a
fixed uranium nucleus. The distance of the closet approach is
of the order of :
o
(a) 1 A
(c) 10-12 cm
(b) 10-10 cm
(d) 10-15 cm
11. When npn transistor is used to an amplifier :
(a) electrons move from base to collector
(b) holes move from emitter to base
(c) electrons move from collector to base
(d) holes move from base to emitter
12. For a transistor amplifier in common emitter configuration for
load impedance of 1 kΩ (hfe = 50 and hoe = 25 μA/V), the
current gain is :
(a) – 5.2
(b)– 15.7
(c) – 24.8
(d) – 48.78
13. A piece of copper and another of germanium are cooled from
room temperature to 77 K, the resistance of :
(a) each of them increases
(b) each of them decreases
(c) copper decreases and germanium increases
(d) copper increases and germanium decreases
14. The manifestation of band structure in solids is due to :
(a) Heisenberg’s uncertainly principle
(b) Pauli’s exclusion principle
(c) Bohr’s correspondence principle
(d) Boltzmann’s law
15. When p-n junction diode is forward biased, then :
(a) the depletion region is reduced and barrier height is
(a) S = ft (b) S =
1 2
1
ft (c) S = ft 2
6
2
(d) S =
1 2
ft
4
24. A particle is moving eastwards with a velocity of 5 ms-1. In 10
increased
seconds the velocity changes to 5 ms-1 northwards. The average
acceleration in this time is :
(b) the depletion region is widened and barrier height is
(a)
reduced
(c) both the depletion region and barrier height are reduced
(d) both the depletion region and barrier height are increased
16. A projectile can have the same range ‘R’ for two angles of
projection. If ‘t1’ and ‘t2’ be the times of flights in the two cases,
then the product of the two times of flights is proportional to :
(a)
(a) 2 sin Φ (b) 2 cos Φ(c) 2 tan Φ (d) tan Φ
20. A bullet fired into a fixed target loses half of its velocity after
penetrating 3 cm. How much further it will penetrate before
coming to rest, assuming that it faces constant resistance to motion
?
(a) 3.0 cm(b) 2.0 cm(c) 1.5 cm
(d) 1.0 cm
21. Out of the following pairs, which one does not have identical
dimensions ?
(a) Angular momentum and Planck’s constant
(b) Impulse and momentum
(c) Moment of inertia and moment of a force
(d) Work and torque
22. The relation between time t and distance x is t = ax2 + bx,
where a and b are constants. The acceleration is :
(a) – 2abv2(b) 2bv3(c) – 2av3(d) 2av2
23. A car, starting from rest, accelerates at the rate f through a
distance S, then continues at constant speed for time t and then
decelerates at the rate f/2 to come to rest. If the total distance
traveled is 15 S, then :
R 2 (b)
1
1
2 (c)
R
R
(d) R
17. An annular ring with inner and outer radii R1 and R2 is rolling
1
1
ms- 1 towards NE (b) ms- 1 towards N
2
2
1 -1
towards NE
(c) zero
(d) ms
2
25. A parachutist after bailing out falls 50 m without friction.
When parachute opens, it decelerates at 2 m/s2. He reaches the
ground with a speed of 3 m/s. At what height, did he bail out ?
(a) 91 m (b) 182 m
(c) 293 m
(d) 111 m
26. A block is kept on a frictionless inclined surface with angle of
inclination ‘α’. The incline is given an acceleration ‘a’ to keep the
block stationary. Then ‘a’ is equal to :
without slipping with a uniform angular speed. The ratio of the
forces experienced by the two particles situated on the inner and
outer parts of the ring,
F1
, is :
F2
æR1 ö2
R2
R
(a)
(b) ç
÷ (c) 1 (d) 1
R1
R2
è R2 ø
18. A smooth block is released at rest on a 45 0 incline and then
slides a distance ‘d’. The time taken to slide is ‘n’ times as much to
slid on rough incline than on a smooth incline. The coefficient of
friction is :
1
(a) μ k = 1- 2
n
1
(c) μ k = 1- 2
n
1
(b) μ k = 1- 2
n
1
(d) μ k = 1- 2
n
19. The upper half of an inclined plane with inclination Φ is
perfectly smooth, while the lower half is rough. A body starting
from rest at the lop will again come to rest at the bottom, if the
coefficient of friction for the lower half is given by :
(a) g/tan α (b) g cosec α (c) g
(d) g tan α
27. A spherical ball of mass 20 kg is stationary at the top of a hill
of height 100 m. It rolls down a smooth surface to the ground, then
climbs up another hill of height 30m and finally rolls down to a
horizontal base at a height of 20 m above the ground. The velocity
attained by the ball is :
(d) 10 3 m / s
28. A body A of mass M while falling vertically downwards under
(a) 40 m/s(b) 20 m/s(c) 10 m/s
gravity breaks into two parts, a body B of mass M/3 and, a body C
of mass M/3. The centre of mass of bodies B and C taken together
shifts compared to that of body A towards :
(a) depends on height of breaking
(b) does not shift
(c) body C
(d) body B
29. The moment of inertia of uniform semicircular disc of mass M
and radius r about a line perpendicular to the plane of the dist
through the centre is :
(a)
1
2
1
Mr 2 (b) Mr 2 (c) Mr 2 (d) Mr 2
4
5
2
30. A particle of mass 0.3 kg is subjected to a force F = - kx with
k = 15 N/m. What will be its initial acceleration, if it is released
from a point 20 cm away from the origin ?
(a) 3 m/s2(b) 15 m/s2(c) 5 m/s2
(d) 10 m/s2