The oscillations of a simple pendulum are –
(A) Non-periodic
(B) Linear
(C) Simple harmonic
(D) Damped
Answer: (C)
White light is composed of –
(A) 3 colors
(B) 5 colors
(C) 7 colors
(D) Infinite colors
Answer: (C)
A force of 1 N acting over 1 m does –
(A) 1 W of work
(B) 1 J of work
(C) 1 cal of work
(D) 1 N/m of work
Answer: (B)
Echo is best heard when distance from reflecting surface is –
(A) < 5 m
(B) > 17 m
(C) < 10 m
(D) > 50 m
Answer: (B)
The best absorber and best emitter of heat is –
(A) White surface
(B) Black surface
(C) Silvered surface
(D) Polished surface
Answer: (B)
SI unit of electric field is –
(A) Volt
(B) Newton
(C) Volt/meter
(D) Coulomb/meter
Answer: (C)
The direction of heat flow is from –
(A) Cold to hot
(B) Hot to cold
(C) Lower pressure to higher
(D) Varies
Answer: (B)
A zero resultant force means –
(A) Constant velocity
(B) Acceleration
(C) Rotation
(D) Change in mass
Answer: (A)
The atmospheric pressure at sea level is approx –
(A) 1 atm
(B) 76 mmHg
(C) 101.3 kPa
(D) All of the above
Answer: (D)
A vector has –
(A) Only magnitude
(B) Only direction
(C) Both magnitude and direction
(D) Unit only
Answer: (C)
Magnetic poles always exist in –
(A) Isolated forms
(B) Pairs
(C) Triplets
(D) Circles
Answer: (B)
Galileo was the first to describe –
(A) Law of gravity
(B) Law of inertia
(C) Electric current
(D) Kinetic energy
Answer: (B)
Light travels fastest in –
(A) Air
(B) Glass
(C) Diamond
(D) Vacuum
Answer: (D)
The unit of capacitance is –
(A) Coulomb
(B) Farad
(C) Henry
(D) Ohm
Answer: (B)
A device used to convert mechanical energy into electrical energy is –
(A) Motor
(B) Transformer
(C) Generator
(D) Rectifier
Answer: (C)
The rate of change of displacement is –
(A) Acceleration
(B) Velocity
(C) Force
(D) Energy
Answer: (B)
Kelvin temperature scale begins from –
(A) Boiling point of water
(B) Freezing point
(C) Absolute zero
(D) Room temperature
Answer: (C)
A liquid with more cohesive force forms –
(A) Larger drops
(B) Smaller drops
(C) Flat surface
(D) Bubbles
Answer: (A)
The rest mass of photon is –
(A) 1
(B) 0
(C) Infinite
(D) Variable
Answer: (B)
A negative charge placed in an electric field moves –
(A) Along field
(B) Opposite to field
(C) Randomly
(D) In circle
Answer: (B)
A spherical mirror that diverges rays is –
(A) Plane
(B) Concave
(C) Convex
(D) Parabolic
Answer: (C)
Ohm’s Law states V is proportional to –
(A) R
(B) I
(C) P
(D) Q
Answer: (B)
Kinetic energy of rotating body is –
(A) ½mv²
(B) ½Iω²
(C) Iω
(D) mv
Answer: (B)
1 Pascal equals –
(A) 1 N/m
(B) 1 N/m²
(C) 1 J/m²
(D) 1 kg/m²
Answer: (B)
A uniform motion means –
(A) Constant speed
(B) Constant acceleration
(C) Varying direction
(D) Random motion
Answer: (A)
The unit of magnetic field intensity is –
(A) Ampere
(B) Tesla
(C) Ampere/meter
(D) Weber
Answer: (C)
Mass × velocity gives –
(A) Acceleration
(B) Power
(C) Momentum
(D) Force
Answer: (C)
The unit of angular displacement is –
(A) Degree
(B) Radian
(C) Cycle
(D) Hertz
Answer: (B)
Electric current is defined as –
(A) Flow of charge
(B) Flow of mass
(C) Potential difference
(D) Number of electrons
Answer: (A)
The impedance in an AC circuit is –
(A) Opposition to current
(B) Inductance
(C) Reactance
(D) Combination of resistance and reactance
Answer: (D)
A ball thrown vertically up returns with –
(A) Lower velocity
(B) Same velocity
(C) Higher velocity
(D) No velocity
Answer: (B)
X-rays were discovered by –
(A) Rutherford
(B) Röntgen
(C) Curie
(D) Planck
Answer: (B)
Electron was discovered by –
(A) Newton
(B) Thomson
(C) Bohr
(D) Faraday
Answer: (B)
The speed of electromagnetic waves in vacuum is –
(A) 3 × 10⁸ m/s
(B) 3 × 10⁶ m/s
(C) 10⁵ m/s
(D) 1.5 × 10⁸ m/s
Answer: (A)
Fission produces –
(A) Less energy than fusion
(B) Equal to fusion
(C) More energy than fusion
(D) Depends on fuel
Answer: (A)
Latent heat of fusion is –
(A) Heat to boil
(B) Heat to melt
(C) Heat to burn
(D) Heat to vaporize
Answer: (B)
A device to measure small potential difference is –
(A) Ammeter
(B) Voltmeter
(C) Potentiometer
(D) Thermocouple
Answer: (C)
Static friction is –
(A) Equal to sliding friction
(B) Greater than sliding friction
(C) Less than sliding friction
(D) Zero
Answer: (B)
A magnet can attract –
(A) Non-metals
(B) Plastic
(C) Iron
(D) Copper
Answer: (C)
The color of sky appears blue due to –
(A) Dispersion
(B) Scattering
(C) Reflection
(D) Refraction
Answer: (B)
A transistor works as –
(A) Amplifier
(B) Rectifier
(C) Oscillator
(D) All of these
Answer: (D)
The frequency of AC in India is –
(A) 50 Hz
(B) 60 Hz
(C) 100 Hz
(D) 40 Hz
Answer: (A)
The unit of charge in CGS system is –
(A) Coulomb
(B) Statcoulomb
(C) Farad
(D) Franklin
Answer: (B)
Ball bearings reduce friction by –
(A) Rolling friction
(B) Sliding friction
(C) Increasing pressure
(D) Reducing surface area
Answer: (A)
A neutral atom has –
(A) No electrons
(B) Equal protons and electrons
(C) Equal neutrons and protons
(D) Equal neutrons and electrons
Answer: (B)
Weight of an object is –
(A) Force of gravity on it
(B) Its mass
(C) Constant everywhere
(D) Measured in kg
Answer: (A)
Hard water is due to presence of –
(A) Ca and Mg salts
(B) NaCl
(C) Sugar
(D) CO₂
Answer: (A)
The power dissipated in a resistor is –
(A) V²/R
(B) IR²
(C) P = VI
(D) All of these
Answer: (D)
Neutrons are present in –
(A) All atoms
(B) Only heavy atoms
(C) All nuclei except hydrogen-1
(D) Ions only
Answer: (C)
The maximum wavelength in visible light is for –
(A) Violet
(B) Green
(C) Yellow
(D) Red
Answer: (D)