PHYSICS QUESTIONS (Q.1 – Q.60)
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 μfarad ✓
B) 20 μfarad
C) 200 μfarad
D) 2000 μfarad
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
Q.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
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) √(1/l) ✓
D) 1/√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 m² s⁻²
C) kg m² s⁻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
Q.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
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°C and 200 Ohm at 100°C. 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 2î + ĵ 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 nm 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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