UHS sample paper 2010 Physics
Entrance Self Test 2010
PHYSICS
1.
When a helium atom loses an electron it becomes:
a.
An alpha particle.
b.
Proton
c.
A positive helium ion
d.
A negative helium ion
2. Beta ray emitted by a radioactive substance is
a.
An electron which was existing outside the
nucleus.
b.
An electron which was existing inside the
nucleus .
c.
An electron emitted by the nucleus as a result
of the decay of neutron inside the nucleus.
d.
A pulse of electromagnetic wave
3.
An electric charge in uniform motion produces
a.
An electric field.
b.
A magnetic field
c.
Both magnetic and electric fields.
d.
Neither magnetic nor electric fields
4.
What is emitted by a hot metal filament in
cathode ray tube?
a.
X-ray
b.
Proton
c.
Electron
d.
Photon
5.
If the mass of the bob of a pendulum is doubled
its time period is
a.
Halved
b.
doubled
c.
Unchanged
d.
Increases four times
6.
The centre of Newton rings is dark due to
a.
Polarization
b.
Destructive interference
c.
Constructive interference
d.
Reflection
7.
Which one is most stable element on the basis of
binding energy
a.
Sn
b.
Ba
c.
Kr
d.
Fe
8.
Resistance in RC circuit of time constant 2
second in 1000 ohm. What is value of C in the circuit?
a.
2 micro farad
b.
20 micro farad
c.
200 micro farad
d.
2000 micro farad
9.
The Lenz’s law refers to induced
a.
Emf.
b.
Resistance
c.
Shear
d.
Currents
10.
In which of the following, out put is similar to
NAND gate if input A=0 and input B=1.
a.
NOR
b.
XNOR
c.
XOR.
d.
Both b and c
11.
For atomic hydrogen spectrum, which of the
following series lies in visible region of electromagnetic spectrum?
a.
Lyman series.
b.
Paschen series.
c.
Balmer series.
d.
Bohr series
12.
_______ are the particles that experience strong
nuclear force
a.
Electrons.
b.
Muons.
c.
Neutrinos.
d.
Neutrons
13.
The vertical velocity of ball thrown
upward________ with time
a.
Decreases linearly.
b.
Remains constant.
c.
Doubles
d.
Decreases parabolic ally
14.
The force required to bend the normally straight
path of a particle into a circular path is called ___force
a.
Traveling
b.
Bending
c.
Centrifugal
d.
Centripetal
15.
A disc at rest without slipping, rolls down a
hill of height (3x9.8)m. what is its speed in m/sec when it reaches at the
bottom?
a.
11.4
b.
19.6
c.
22.8
d.
9.8s
16.
Tuning of the radio is the best example of
electrical__
a.
Resonance
b.
Resistance
c.
Current
d.
None of these
17.
A standing wave pattern is formed when the
length of string is an integral multiple of ___wavelength
a.
Triple
b.
Full
c.
Half
d.
Double
18.
Which of the following lights travels the
fastest in optical fibers?
a.
Visible light.
b.
Invisible infra-red
c.
Ultra-violet.
d.
Ordinary light.
19.
The algebraic sum of potential changes in a
closed circuit is zero is Kirchhoff’s ___rule
a.
First
b.
Second
c.
Third
d.
None of these
20.
In LED when an electron combines with a __during
forward bias conduction, a photon of visible light is emitted
a.
High voltage
b.
Photon
c.
Hole
d.
Positron
21.
For photons of energy greater than 1.02 MeV the
probability of pair production occurrence_ as the energy increases.
a.
Increase.
b.
Completely diminishes
c.
Reduces to half
d.
Remains unchanged
22.
The neutron is assumed to be made of
a.
One up quark and two down quarks.
b.
Two up quarks and two down quarks.
c.
Two up quarks and one down quark
d.
One up quark and one down quark
23.
An_______ missile is called a ballistic missile
a.
Un- powered and guided
b.
Unguided and powered
c.
Powered and guided
d.
Un powered and unguided
24.
Two cylinders of equal mass are made from same
material. The one with the larger diameter accelerates__ the other under the
action of same torque
a.
Faster than.
b.
Slower than
c.
Equal to
d.
None of these
25.
The angular frequency of simple pendulum is
directly proportional to
a.
l
b.
1/l
c.
Square root l
d.
Square root 1/l
26.
Two waves of slightly different frequencies and
traveling in same direction produce
a.
Interference
b.
Polarization
c.
Stationary waves.
d.
Beats
27.
A single mode step index fiber has core of
about_________ micro m diameter
a.
50 to 1000
b.
50
c.
30
d.
5
28.
A 5 ohm resistor is indicated by a single
___color band around its body
a.
Red
b.
Green
c.
Blue
d.
Brown
29.
Practically __current flows in a reverse biased
pn junction
a.
No.
b.
Very large
c.
Few mill amperes.
d.
Both
30.
Cesium coated oxidized silver emits electrons
for _____light.
a.
Infrared
b.
Ultraviolet
c.
Visible
d.
Green
31.
The cobalt is absorbed by
a.
Bones
b.
Skin
c.
Liver
d.
Thyroid gland
32.
In a step down transformer the output current
____
a.
Is reduced
b.
Is increased
c.
Remains same
d.
None of these
33.
Force in terms of base units is expressed as
a.
Kg m/s2
b.
Kg m2/s2
c.
Kg m2/s3
d.
None of these
34.
100 joules work has been done by an agency in 10
seconds. What is power of agency?
a.
1000 watt
b.
100
c.
10 watt
d.
0.10 watt
35.
The acceleration is proportional to the
displacement and is directed towards mean position in ____motion
a.
Gravity
b.
Simple harmonic
c.
Uniform
d.
Projectile
36.
In gases the speed of sound is inversely
proportional to _____ of the density when other factors are same
a.
Square root
b.
Square
c.
Third power
d.
Third root
37.
A watch maker uses___ to repair the watches
a.
Telescope
b.
Convex mirror
c.
Convex lens
d.
Concave lens
38.
A 2m long pipe is open at both ends. What is
second harmonic frequency?
a.
42.5 Hz.
b.
85 hz
c.
220 Hz
d.
None of these
39.
A wire has resistance 100 ohm at 0 degree
centigrade and 200 ohm at 100 degree centigrade. What is its temperature
coefficient in K-1?
a.
-0.01.
b.
-1/273
c.
0.01
d.
1/273
40.
The net magnetic field created by the electrons
within an atom is due to the field created by their_ motion.
a.
Orbital
b.
Spin
c.
Orbital and spin
d.
Orbital x spin
41.
At high temperature, the proportion of _____
wavelength radiation increase
a.
AM radio
b.
Long radio
c.
Shorter
d.
Both A and C
42.
In photoelectric effect removal of photons is
observed at________ energies.
a.
Low
b.
High
c.
Intermediate
d.
Both a and c
43.
Which device is the most efficient?
a.
Nuclear reactor
b.
Storage battery
c.
Silicon solar cell
d.
Dry battery cell
44.
The units of E in E = mc2 are
a.
Kg m /s2
b.
Kg m2/s-2
c.
N m /s2
d.
Both b and c
45.
Work done on a body equals change in its__
energy
a.
Total
b.
Potential
c.
Kinetic
d.
All of these
46.
A pipe varies uniformly in diameter from 2 m to
4m an incompressible fluid enters the pipe with velocity 16m/sec. what is
velocity of fluid when it leaves the pipe?
a.
64 m/sec
b.
32 m/sec
c.
8 m/sec
d.
4 m/sec
47.
Transverse waves can not be setup in
a.
Metals
b.
Solids
c.
Fluids
d.
Soil
48.
The ratio of the ____ is called magnification.
a.
Image size to object size
b.
Object size to image size
c.
Eyepiece size to object size
d.
None of these
49.
Which of the following has the highest
resistivity?
a.
Germanium
b.
Silver
c.
Copper
d.
Platinum
50.
An n type semi conductor is made by doping
silicon crystal with_____
a.
Indium
b.
Aluminum
c.
Arsenic
d.
Both b and c
51.
Objects can not be accelerated to the speed of
light in free space is consequence of
a.
Mass variation
b.
Energy mass relationship
c.
Inertia forces
d.
All of these
52.
A certain radioactive mass decays from 64 gm to
2 gm in 20 days. What is its half life?
a.
5 days
b.
4 days
c.
10 days
d.
6 days
53.
If inductance is denoted by L and resistance by
R, which of the following is true for a choke?
a.
R is large , L is very small
b.
R is very small, L is large
c.
Both R and L are large
d.
Both R and L are very small
54.
A force 2i+j has moved its point of application
from(2,3) to (6,5). What is work done?
a.
-10
b.
10
c.
-18
d.
18
55.
The escape velocity corresponds to __ energy
gained by body, which carries it to an infinite distance from the surface of
earth.
a.
Total
b.
Potential
c.
Initial kinetic
d.
None of these
56.
The drag force decreases as the speed of an
object moving through fluid______
a.
Increases
b.
Decreases
c.
Remains constant
d.
Both b and c
57.
Light year is a measure of
a.
Distance
b.
Time
c.
Intensity of light
d.
Velocity
58.
A yellow light of wavelength 500 mm emitted by a
single source passes through two narrow slits 1 mm apart. How far apart are two
adjacent bright fringes when interference is observed on a screen 10 m away?
a.
5 mm
b.
1.33 mm
c.
0.5 mm
d.
50 mm
59.
The heat produced by a current I in the wire of
resistance R during time interval t is
a.
I2/Rt.
b.
I2Rt
c.
I2/R/t
d.
IR2t.
60.
Which of the following is the most ductile?
a.
Glass.
b.
Copper
c.
Cast iron
d.
High carbon steel
Question 15 answer
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