Entrance Test 2008
Physics
Q.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.
Q.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.
Q.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.
Q.4 What is emitted by a hot metal filament in a cathode ray tube?
A) X-ray. B) Proton.
C) Electron. D) Photon.
Q.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.
Q.6 The centre of Newton rings is dark due to:
A) Polarization. B) Destructive interference.
C) Constructive interference. D) Reflection.
Q.7 Which one is most stable element on the basis of binding energy?
A) Sn. B) Ba.
C) Kr. D) Fe.
Q.8 Resistance in RC circuit of time constant 2 seconds is 1000 Ohms. What is value of C in the circuit?
A) 2 μ farad. B) 20 μ farad.
C) 200 μ farad. D) 2000 μ farad
Q.9 The Lenz’s law refers to induced __________
A) emf. B) Resistance.
C) Shear. D) Currents.
Q.10 In which of the following, output is similar to NAND gate if input A=0 and input B=1.
A) NOR. B) XNOR.
C) XOR. D) Both B and C.
Q.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.
Q.12 __________ are the particles that experience strong nuclear force.
A) Electrons. B) Muons.
C) Neutrinos. D) Neutrons.
Q.13 The vertical velocity of ball thrown upward __________ with time.
A) Decreases linearly. B) Remains constant.
C) Doubles. D) Decreases parabolically.
Q.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.
Q.15 A disc at rest without slipping, rolls down a hill of height (3 x 9.8) m. What is its speed in m/sec when it reaches at the bottom?
A) 11.4. B) 19.6.
C) 22.8. D) 9.8.
Q.16 Tuning of the radio is the best example of electrical __________
A) Resonance. B) Resistance.
C) Current. D) None of these.
Q.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.
Q.18 Which of the following lights travels the fastest in optical fibres?
A) Visible light. B) Invisible infra-red.
C) Ultra-violet. D) Ordinary light.
Q.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.
Q.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.
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.
Q.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.
Q.23 An __________ missile is called a ballistic missile.
A) Un-powered and guided. B) Un-guided and powered.
C) Powered and guided. D) Un-powered and un-guided.
Q.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.
Q.25 The angular frequency of simple pendulum is directly proportional to __________
A) l. B) 1/l.
C) v l. D) v1/l.
Q.26 Two waves of slightly different frequencies and traveling in same direction produce ________
A) Interference. B) Polarization.
C) Stationary waves. D) Beats.
Q.27 A single mode step index fibre has core of about __________ μm diameter
A) 50 to 1000. B) 50.
C) 30. D) 5.
Q.28 A 5 Ohm resistor is indicated by a single __________ color band around its body.
A) Red. B) Green.
C) Blue. D) Brown.
Q.29 Practically __________ current flows in a reverse biased p-n junction.
A) No. B) Very large.
C) Few milliamperes. D) Both A and C.
Q.30 Cesium coated oxidized silver emits electrons for __________ light.
A) Infrared. B) Ultraviolet.
C) Visible. D) Green.
Q.31 The cobalt is absorbed by
A) Bones. B) Skin.
C) Liver. D) Thyroid gland.
Q.32 In a step-down transformer the output current __________
A) Is reduced. B) Is increased.
C) Remains same. D) None of these.
Q.33 Force in terms of base units is expressed as
A) kg ms-2. B) kg m2s-2.
C) kg m2s-3. D) None of these.
Q.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.
Q.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.
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.
Q.37 A watch maker uses __________ to repair the watches.
A) Telescope. B) Convex mirror.
C) Convex lens. D) Concave lens.
Q.38 A 2m long pipe is open at both ends. What is its harmonic frequency?
A) 42.5 Hz. B) 85 Hz.
C) 220 Hz. D) None of these.
Q.39 A wire has resistance 100 Ohm at 0 oC and 200 Ohm at 100 oC. What is its temperature coefficient in K-1?
A) -0.01. B) -1/273.
C) 0.01. D) 1/273.
Q.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 & spin. D) Orbital x spin.
Q.41 At high temperature, the proportion of __________ wavelength radiation increase.
A) AM radio. B) Long radio.
C) Shorter. D) Both A and C.
Q.42 In photoelectric effect removal of photons is observed at _________ energies.
A) Low. B) High.
C) Intermediate. D) Both A and C.
Q.43 Which device is the most efficient?
A) Nuclear reactor. B) Storage battery.
C) Silicon solar cell. D) Dry battery cell.
Q.44 The units of E in E=mc2 are
A) kg m s-2. B) N m s-2.
C) kg m2 s-2. D) Both B and C.
Q.45 Work done on a body equals change in its __________ energy.
A) Total. B) Potential.
C) Kinetic. D) All of these.
Q.46 A pipe varies uniformly in diameter from 2 m to 4 m. 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.
Q.47 Transverse waves cannot be setup in __________
A) Metals. B) Solids.
C) Fluids. D) Soil.
Q.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
Q.49 Which of the following has the highest resistivity?
A) Germanium. B) Silver.
C) Copper. D) Platinum.
Q.50 An n-type semi-conductor is made by doping silicon crystal with __________
A) Indium. B) Aluminium.
C) Arsenic. D) Both B and C.
Q.51 Objects cannot 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.
Q.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.
Q.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.
Q.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.
Q.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.
Q.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.
Q.57 Light year is a measure of
A) Distance. B) Time.
C) Intensity of light. D) Velocity.
Q.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.
Q.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.
Q.60 Which of the following is the most ductile?
A) Glass. B) Copper.
C) Cast iron. D) High carbon steel.
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Answer Key :
1 C
2 B
3 C
4 C
5 C
6 B
7 D
8 C
9 D
10 C
11 C
12 D
13 C
14 D
15 A
16 A
17 C
18 B
19 B
20 C
21 A
22 A
23 D
24 A
25 D
26 D
27 D
28 B
29 D
30 A
31 C
32 B
33 A
34 C
35 B
36 A
37 C
38 B
39 D
40 D
41 D
42 D
43 A
44 C
45 D
46 D
47 C
48 A
49 B
50 C
51 D
52 B
53 B
54 B
55 C
56 B
57 A
58 A
59 B
60 B
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