The specific heat capacity is defined as –
(A) Heat required to raise temperature of 1 kg by 1°C
(B) Heat required to melt 1 kg
(C) Heat to vaporize 1 mole
(D) Heat needed to break bonds
Answer: (A)
A light object falls as fast as a heavy one in vacuum due to –
(A) No air resistance
(B) Earth’s pull is selective
(C) No gravity in vacuum
(D) Both hit terminal velocity
Answer: (A)
Power is the rate of –
(A) Acceleration
(B) Energy transfer
(C) Momentum
(D) Friction
Answer: (B)
A battery converts –
(A) Chemical energy to electrical energy
(B) Mechanical to thermal
(C) Thermal to electrical
(D) Kinetic to magnetic
Answer: (A)
The refractive index of water is –
(A) Less than 1
(B) 1
(C) Greater than 1
(D) Negative
Answer: (C)
Wheatstone bridge is used to measure –
(A) Voltage
(B) Current
(C) Resistance
(D) Power
Answer: (C)
Isotopes differ in –
(A) Proton number
(B) Neutron number
(C) Electron charge
(D) Atomic number
Answer: (B)
The blue color of ocean is due to –
(A) Refraction
(B) Absorption of red light
(C) Reflection of sky
(D) Scattering of light
Answer: (D)
Dynamo converts –
(A) Magnetic energy to thermal
(B) Electrical to mechanical
(C) Mechanical to electrical
(D) Sound to light
Answer: (C)
Magnifying power of a microscope is the ratio of –
(A) Image height to object height
(B) Focal length to object distance
(C) Lens radius to object size
(D) Real and virtual height
Answer: (A)
Thermocouple works on –
(A) Seebeck effect
(B) Photoelectric effect
(C) Piezoelectricity
(D) Ohm’s law
Answer: (A)
A satellite in orbit is in –
(A) Rest
(B) Uniform motion
(C) Free fall
(D) Zero gravity zone
Answer: (C)
Lenz’s Law obeys –
(A) Law of inertia
(B) Law of conservation of energy
(C) Newton’s third law
(D) Archimedes’ principle
Answer: (B)
Nuclear reactors use –
(A) Thermal energy
(B) Fission reaction
(C) Fusion energy
(D) Mechanical energy
Answer: (B)
The focal length of a lens depends on –
(A) Curvature
(B) Refractive index
(C) Medium
(D) All of the above
Answer: (D)
Echo is heard when sound is reflected from a surface –
(A) Less than 5 m away
(B) 10 m away
(C) More than 17 m away
(D) Close to the ear
Answer: (C)
The unit of electric flux is –
(A) Volt
(B) Newton
(C) Nm²/C
(D) Coulomb
Answer: (C)
Spherical aberration occurs in –
(A) Lenses only
(B) Mirrors only
(C) Both lenses and mirrors
(D) Prisms
Answer: (C)
Torque is the rotational analog of –
(A) Force
(B) Energy
(C) Power
(D) Work
Answer: (A)
A floating body has –
(A) Zero weight
(B) Equal weight and upthrust
(C) High mass
(D) Vacuum inside
Answer: (B)
Young’s modulus is related to –
(A) Volume
(B) Temperature
(C) Length
(D) Pressure
Answer: (C)
Beta particles are –
(A) Neutrons
(B) Electrons
(C) Protons
(D) Helium nuclei
Answer: (B)
The SI unit of conductance is –
(A) Siemens
(B) Ohm
(C) Farad
(D) Ampere
Answer: (A)
Planck’s constant has unit –
(A) Js
(B) Nm
(C) J/kg
(D) m/s
Answer: (A)
The coefficient of friction is –
(A) Unitless
(B) m/s
(C) kg/m³
(D) Newton
Answer: (A)
Hooke’s Law states that –
(A) Stress is proportional to strain
(B) Force equals displacement
(C) Energy equals force
(D) Resistance is constant
Answer: (A)
A fiber optic cable transmits light via –
(A) Refraction
(B) Total internal reflection
(C) Diffraction
(D) Polarization
Answer: (B)
Heat energy transfer without medium is –
(A) Conduction
(B) Convection
(C) Radiation
(D) None
Answer: (C)
Resonance occurs when –
(A) Natural frequency equals forced frequency
(B) Amplitude becomes zero
(C) Wave is reflected
(D) Speed is maximum
Answer: (A)
Tangent galvanometer is used to –
(A) Produce current
(B) Measure magnetic field
(C) Induce charge
(D) Store energy
Answer: (B)
Absolute zero temperature implies –
(A) Zero heat
(B) Zero volume
(C) No molecular motion
(D) Zero pressure
Answer: (C)
Power factor in an AC circuit is –
(A) Ratio of resistance to reactance
(B) Ratio of real power to apparent power
(C) Product of current and voltage
(D) Voltage divided by impedance
Answer: (B)
Quantum theory was introduced by –
(A) Newton
(B) Bohr
(C) Planck
(D) Einstein
Answer: (C)
The unit of permittivity is –
(A) F/m
(B) V/m
(C) A·m
(D) N/C
Answer: (A)
Energy stored in capacitor is –
(A) ½ CV²
(B) V²/R
(C) IR²
(D) Q²V
Answer: (A)
Critical temperature for superconductors is –
(A) Above 100°C
(B) Below boiling point
(C) Very low
(D) Undefined
Answer: (C)
Radioactivity is measured in –
(A) Curie
(B) Hertz
(C) Joule
(D) Tesla
Answer: (A)
The hardness of X-rays depends on –
(A) Frequency
(B) Speed
(C) Wavelength
(D) Penetration
Answer: (D)
The sun emits maximum radiation in –
(A) UV
(B) Visible
(C) Infrared
(D) Microwave
Answer: (B)
Electron microscope uses –
(A) Light
(B) Infrared
(C) Electron beams
(D) UV
Answer: (C)
Escape velocity is independent of –
(A) Planet’s radius
(B) Planet’s mass
(C) Object’s mass
(D) Gravitational pull
Answer: (C)
A galvanometer can be converted to ammeter by –
(A) High resistance in parallel
(B) Low resistance in series
(C) Low resistance in parallel
(D) Removing resistance
Answer: (C)
The slope of velocity-time graph gives –
(A) Distance
(B) Acceleration
(C) Speed
(D) Force
Answer: (B)
The value of acceleration due to gravity varies with –
(A) Altitude
(B) Latitude
(C) Depth
(D) All of the above
Answer: (D)
Gravitational potential energy depends on –
(A) Mass and height
(B) Temperature
(C) Surface area
(D) Volume
Answer: (A)
The unit of strain is –
(A) Newton
(B) Watt
(C) Dimensionless
(D) Pascal
Answer: (C)
A battery’s EMF is –
(A) Potential difference with load
(B) Energy per unit charge
(C) Magnetic field
(D) Temperature
Answer: (B)
Gamma rays are produced from –
(A) Electron transitions
(B) Nucleus
(C) Cathode
(D) Vacuum tube
Answer: (B)
A diopter is a unit of –
(A) Lens power
(B) Focal length
(C) Light speed
(D) Resistance
Answer: (A)
Conduction is fastest in –
(A) Gases
(B) Liquids
(C) Solids
(D) Vacuum
Answer: (C)