The amount of heat required to raise the temperature of 1 gram of water by 1°C is called –
(A) Specific heat
(B) Thermal capacity
(C) Calorie
(D) Latent heat
Answer: (C)
The SI unit of charge is –
(A) Ampere
(B) Coulomb
(C) Volt
(D) Ohm
Answer: (B)
A liquid’s boiling point increases with –
(A) Decreasing pressure
(B) Increasing pressure
(C) Lower temperature
(D) Reducing volume
Answer: (B)
The phenomenon of bending of light around corners is called –
(A) Refraction
(B) Reflection
(C) Dispersion
(D) Diffraction
Answer: (D)
Ammeter is always connected –
(A) In parallel
(B) In series
(C) Across power source
(D) Across resistor
Answer: (B)
The main purpose of using convex mirrors in vehicles is –
(A) To get a real image
(B) To see magnified image
(C) To get a wider field of view
(D) To invert the image
Answer: (C)
The time period of a simple pendulum is independent of –
(A) Length
(B) Mass
(C) Acceleration due to gravity
(D) Amplitude (for small angles)
Answer: (B)
A free electron experiences the maximum force in a magnetic field when it moves –
(A) Parallel to the field
(B) Perpendicular to the field
(C) At 45° to the field
(D) In circular motion
Answer: (B)
The magnetic field strength due to a straight current-carrying conductor –
(A) Decreases with distance
(B) Increases with distance
(C) Remains constant
(D) Becomes zero
Answer: (A)
The rate of change of displacement is –
(A) Speed
(B) Velocity
(C) Acceleration
(D) Work
Answer: (B)
The property of a body to oppose change in its state of motion is –
(A) Friction
(B) Inertia
(C) Torque
(D) Thrust
Answer: (B)
Loudness of sound is measured in –
(A) Hz
(B) Decibels
(C) m/s
(D) Pascal
Answer: (B)
The critical angle for water–air interface is approximately –
(A) 30°
(B) 45°
(C) 49°
(D) 60°
Answer: (C)
The mirror used in solar furnaces is –
(A) Plane
(B) Convex
(C) Concave
(D) Spherical
Answer: (C)
The unit of potential gradient is –
(A) Volt/meter
(B) Volt/second
(C) Ohm/meter
(D) Coulomb/meter
Answer: (A)
The device that converts sound energy to electrical energy is –
(A) Amplifier
(B) Microphone
(C) Speaker
(D) Diode
Answer: (B)
The speed of sound is maximum in –
(A) Air
(B) Water
(C) Iron
(D) Vacuum
Answer: (C)
Capacitor is used in electric circuits to –
(A) Resist current
(B) Store energy
(C) Conduct electricity
(D) Amplify voltage
Answer: (B)
The electromotive force (emf) is measured in –
(A) Coulombs
(B) Volts
(C) Newton
(D) Ohm
Answer: (B)
The displacement-time graph for uniform motion is –
(A) Straight line
(B) Parabola
(C) Curve
(D) Exponential
Answer: (A)
The power factor in a purely resistive circuit is –
(A) 0
(B) 0.5
(C) 1
(D) –1
Answer: (C)
The image formed by convex lens is virtual when the object is –
(A) At infinity
(B) At 2F
(C) Between F and lens
(D) Beyond 2F
Answer: (C)
The impulse acting on a body equals –
(A) Change in velocity
(B) Force × time
(C) Work done
(D) Energy lost
Answer: (B)
The energy of a wave depends on its –
(A) Frequency
(B) Amplitude²
(C) Velocity
(D) Wavelength
Answer: (B)
The specific resistance of a wire depends on –
(A) Length
(B) Area
(C) Material
(D) Temperature
Answer: (C)
Diffusion of light in the atmosphere causes –
(A) Glare
(B) Twilight
(C) Mirage
(D) Rainbow
Answer: (B)
Fleming’s right-hand rule is used to determine –
(A) Direction of induced emf
(B) Direction of magnetic force
(C) Direction of current
(D) Direction of torque
Answer: (A)
The minimum possible temperature in Kelvin is –
(A) 0 K
(B) –273 K
(C) 273 K
(D) 100 K
Answer: (A)
The force that keeps a satellite in orbit is –
(A) Centrifugal
(B) Centripetal
(C) Gravitational
(D) Magnetic
Answer: (C)
SI unit of radiation dose is –
(A) Sievert
(B) Curie
(C) Tesla
(D) Candela
Answer: (A)
The strength of an electromagnet increases with –
(A) Decreasing number of turns
(B) Use of copper core
(C) Increasing current
(D) Decreasing current
Answer: (C)
Friction converts kinetic energy into –
(A) Light
(B) Heat
(C) Sound
(D) Magnetic energy
Answer: (B)
Bohr’s model of the atom explains –
(A) Spectrum of hydrogen
(B) Nuclear fusion
(C) Gravitational force
(D) Motion of satellites
Answer: (A)
SI unit of luminous efficacy is –
(A) Lumen/watt
(B) Lux
(C) Candela
(D) Watt
Answer: (A)
The mechanical advantage of a machine is –
(A) Output/input distance
(B) Output/input force
(C) Work output/input
(D) Power output/input
Answer: (B)
A battery stores –
(A) Magnetic energy
(B) Electrical energy
(C) Chemical energy
(D) Thermal energy
Answer: (C)
Ampere’s law relates –
(A) Electric field and charge
(B) Magnetic field and current
(C) Voltage and power
(D) Force and time
Answer: (B)
The force between two parallel wires carrying current is –
(A) Magnetic repulsion
(B) Magnetic attraction or repulsion
(C) Electric force
(D) Always repulsive
Answer: (B)
SI unit of angular momentum is –
(A) kg·m/s
(B) kg·m²/s
(C) N·m
(D) J·s
Answer: (B)
A superconductor is a material with –
(A) Infinite resistance
(B) Zero resistance
(C) High thermal conductivity
(D) Maximum magnetic field
Answer: (B)
The coefficient of friction is the ratio of –
(A) Force to area
(B) Normal force to friction
(C) Frictional force to normal force
(D) Mass to weight
Answer: (C)
A ray passing through the center of curvature of a concave mirror –
(A) Reflects back along the same path
(B) Passes undeviated
(C) Gets refracted
(D) Forms a virtual image
Answer: (A)
The frequency of 50 Hz means –
(A) 50 vibrations per second
(B) 50 Joules per second
(C) 50 Newtons
(D) 50 meters per second
Answer: (A)
Thermopile is a device to measure –
(A) High voltage
(B) High pressure
(C) Radiation
(D) Electric current
Answer: (C)
Laws of reflection hold true for –
(A) Plane surfaces only
(B) All types of surfaces
(C) Rough surfaces
(D) Transparent media
Answer: (B)
The instrument used to measure current is –
(A) Voltmeter
(B) Ammeter
(C) Galvanometer
(D) Potentiometer
Answer: (B)
The mass of a body is –
(A) Variable
(B) Same everywhere
(C) Depends on gravity
(D) Zero in space
Answer: (B)
Frictional force always acts –
(A) In the direction of motion
(B) Opposite to the direction of motion
(C) Perpendicular to motion
(D) At rest
Answer: (B)
Water boils at a lower temperature at high altitudes due to –
(A) High pressure
(B) Low pressure
(C) High gravity
(D) More oxygen
Answer: (B)
Kinetic energy is given by –
(A) mv²
(B) ½mv²
(C) mgh
(D) F × d
Answer: (B)