Newton per Coulomb is the unit of –
(A) Potential
(B) Electric field
(C) Current
(D) Resistance
Answer: (B)
Angular velocity is measured in –
(A) rad
(B) rad/s
(C) rad/s²
(D) degree
Answer: (B)
In synchronous motors, the speed is –
(A) Variable
(B) Independent of load
(C) Increases with load
(D) Constant and independent of frequency
Answer: (B)
Zero Kelvin represents –
(A) Room temperature
(B) Normal body temperature
(C) Absolute zero
(D) Boiling point of nitrogen
Answer: (C)
A diode allows current to flow in –
(A) Forward direction only
(B) Reverse direction only
(C) Both directions
(D) No direction
Answer: (A)
The pressure at the bottom of a liquid column increases with –
(A) Height only
(B) Density only
(C) Both height and density
(D) Surface area
Answer: (C)
A solar panel converts –
(A) Light to electricity
(B) Heat to electricity
(C) Electricity to light
(D) Light to heat
Answer: (A)
The S.I. unit of thermodynamic temperature is –
(A) Celsius
(B) Fahrenheit
(C) Kelvin
(D) Joule
Answer: (C)
The potential energy of a mass m at a height h is –
(A) mgh
(B) mg/h
(C) m/h
(D) mh/g
Answer: (A)
A charged particle experiences no force in a magnetic field when –
(A) It moves parallel to field
(B) It moves perpendicular to field
(C) It is stationary
(D) Both A and C
Answer: (D)
The SI unit of density is –
(A) kg/m
(B) kg/m²
(C) kg/m³
(D) N/m³
Answer: (C)
Electromagnetic waves are –
(A) Longitudinal
(B) Transverse
(C) Mechanical
(D) Sound waves
Answer: (B)
A metal feels colder than wood in winter because –
(A) Metal has higher density
(B) Metal has higher specific heat
(C) Metal is a good conductor of heat
(D) Wood reflects heat
Answer: (C)
The dimension of pressure is –
(A) ML⁻¹T⁻²
(B) MLT⁻²
(C) ML²T⁻²
(D) M²L⁻²T⁻²
Answer: (A)
A body moving with uniform speed in circular path has –
(A) Constant velocity
(B) Constant acceleration
(C) Constant speed
(D) Zero force
Answer: (C)
Electric fuse wire has –
(A) High melting point
(B) Low melting point
(C) High resistance
(D) Both B and C
Answer: (D)
The SI unit of radiation intensity is –
(A) Watt
(B) Watt/steradian
(C) Watt/m²
(D) Candela
Answer: (C)
In an ideal gas, pressure is directly proportional to –
(A) Volume
(B) Temperature
(C) Density
(D) Area
Answer: (B)
Gamma radiation is emitted from –
(A) Electron cloud
(B) Nucleus
(C) Orbit
(D) Positron
Answer: (B)
A neutral atom has –
(A) No electrons
(B) No neutrons
(C) Equal protons and electrons
(D) Equal protons and neutrons
Answer: (C)
The rate of doing work is called –
(A) Energy
(B) Power
(C) Force
(D) Impulse
Answer: (B)
The power of a convex lens is –
(A) Positive
(B) Negative
(C) Zero
(D) Always less than 1
Answer: (A)
The acceleration-time graph of uniformly accelerating object is –
(A) Straight line parallel to time axis
(B) Parabola
(C) Vertical line
(D) Horizontal at origin
Answer: (A)
A light object and heavy object fall with same acceleration because –
(A) Gravity is constant
(B) Mass is irrelevant
(C) Friction cancels weight
(D) Weight is proportional to mass
Answer: (D)
SI unit of linear momentum is –
(A) kg·m/s
(B) N·m
(C) m/s
(D) kg·m²/s
Answer: (A)
Convex mirrors are used in rear-view mirrors because –
(A) They magnify the image
(B) They focus rays
(C) They give wide field of view
(D) They form real images
Answer: (C)
Laws of motion were given by –
(A) Einstein
(B) Kepler
(C) Newton
(D) Faraday
Answer: (C)
A magnet loses its properties when –
(A) Cooled
(B) Heated
(C) Cut
(D) Moved
Answer: (B)
The device to store electrical energy is –
(A) Inductor
(B) Resistor
(C) Capacitor
(D) Transistor
Answer: (C)
Tides are a result of –
(A) Wind
(B) Earthquake
(C) Moon’s gravity
(D) Solar flare
Answer: (C)
The transmission of heat in vacuum is by –
(A) Conduction
(B) Convection
(C) Radiation
(D) All of these
Answer: (C)
A neutral conductor can be charged by –
(A) Friction
(B) Conduction
(C) Induction
(D) Both B and C
Answer: (D)
A tuning fork produces –
(A) Light
(B) High amplitude
(C) Constant frequency
(D) Alternating voltage
Answer: (C)
Mirage is a result of –
(A) Reflection
(B) Total internal reflection
(C) Refraction
(D) Diffraction
Answer: (B)
The capacity of a battery is expressed in –
(A) Watts
(B) Ampere
(C) Ampere-hour
(D) Watt-second
Answer: (C)
A current carrying wire generates –
(A) Electric field
(B) Gravitational field
(C) Magnetic field
(D) Nuclear field
Answer: (C)
Diffusion is fastest in –
(A) Solids
(B) Liquids
(C) Gases
(D) Vacuum
Answer: (C)
A rainbow is caused by –
(A) Interference
(B) Scattering
(C) Total internal reflection
(D) Dispersion
Answer: (D)
A microscope uses –
(A) Concave lens
(B) Convex lens
(C) Plane mirror
(D) None of these
Answer: (B)
A screw jack works on –
(A) Lever principle
(B) Inclined plane
(C) Pascal’s law
(D) Hooke’s law
Answer: (B)
Archimedes’ principle is applicable to –
(A) Gases only
(B) Liquids only
(C) Both liquids and gases
(D) Solids
Answer: (C)
A CD player reads information using –
(A) Laser beam
(B) Magnetic head
(C) Infrared
(D) Radio waves
Answer: (A)
A fish looks bigger under water due to –
(A) Reflection
(B) Refraction
(C) Diffusion
(D) Magnification
Answer: (B)
Twinkling of stars is due to –
(A) Rotation of Earth
(B) Refraction of light
(C) Dispersion of light
(D) Absorption
Answer: (B)
The pitch of a sound depends on –
(A) Frequency
(B) Amplitude
(C) Speed
(D) Energy
Answer: (A)
Hardness of a material is its resistance to –
(A) Tension
(B) Cutting
(C) Deformation
(D) Compression
Answer: (C)
SI unit of heat energy is –
(A) Calorie
(B) Watt
(C) Kelvin
(D) Joule
Answer: (D)
Oscillations of a pendulum are –
(A) Uniform motion
(B) Non-periodic
(C) Simple harmonic
(D) Accelerated
Answer: (C)
A beam of white light is dispersed into different colors by –
(A) Mirror
(B) Lens
(C) Prism
(D) Glass slab
Answer: (C)
Comet tails are pushed away from the sun due to –
(A) Gravity
(B) Light pressure
(C) Solar wind
(D) Tidal force
Answer: (C)