The resistance of a wire is directly proportional to –
(A) Its length
(B) Its area
(C) Its voltage
(D) Its current
Answer: (A)
Thermocouples are used to measure –
(A) Current
(B) Voltage
(C) Temperature
(D) Pressure
Answer: (C)
SI unit of charge density is –
(A) C/m²
(B) C/m³
(C) C/m
(D) A/m
Answer: (B)
The electrical energy consumed is calculated as –
(A) VI
(B) VIt
(C) IR
(D) V²R
Answer: (B)
A concave mirror is used in –
(A) Rear-view mirror
(B) Street lights
(C) Solar cookers
(D) Decorative mirrors
Answer: (C)
Radio waves travel –
(A) Faster than light
(B) At the speed of light
(C) Slower than sound
(D) Slower than infrared
Answer: (B)
The gravitational field inside Earth –
(A) Increases with depth
(B) Decreases with depth
(C) Is constant
(D) Is zero at surface
Answer: (B)
Resistance of a conductor is measured in –
(A) Ampere
(B) Volt
(C) Ohm
(D) Watt
Answer: (C)
The most basic law of electrostatics is –
(A) Gauss’s law
(B) Coulomb’s law
(C) Ohm’s law
(D) Kirchhoff’s law
Answer: (B)
A rotating fan is an example of –
(A) Translational motion
(B) Vibrational motion
(C) Circular motion
(D) Random motion
Answer: (C)
Relative density has –
(A) Units of kg/m³
(B) Units of g/cm³
(C) No units
(D) Units of Pascal
Answer: (C)
A balanced force can –
(A) Accelerate an object
(B) Change motion
(C) Deform a body
(D) Do work
Answer: (C)
The value of g is maximum at –
(A) Equator
(B) Poles
(C) Center of Earth
(D) Sea level
Answer: (B)
Optical fibre works on –
(A) Refraction
(B) Reflection
(C) Total internal reflection
(D) Diffraction
Answer: (C)
The least count of a screw gauge is usually –
(A) 1 mm
(B) 0.1 mm
(C) 0.01 mm
(D) 0.001 mm
Answer: (D)
The nuclear force is –
(A) Electromagnetic
(B) Gravitational
(C) Weak
(D) Short-range and strong
Answer: (D)
A bar magnet has –
(A) One pole
(B) No poles
(C) Two poles
(D) Variable poles
Answer: (C)
A transformer works on –
(A) AC only
(B) DC only
(C) Both AC and DC
(D) Static electricity
Answer: (A)
The heat transfer in solids occurs mainly by –
(A) Conduction
(B) Convection
(C) Radiation
(D) Reflection
Answer: (A)
The loudness of sound is related to –
(A) Frequency
(B) Wavelength
(C) Amplitude
(D) Phase
Answer: (C)
1 Volt is equal to –
(A) 1 J/C
(B) 1 N·m
(C) 1 W/A
(D) 1 C/s
Answer: (A)
A magnet cannot attract –
(A) Nickel
(B) Iron
(C) Copper
(D) Cobalt
Answer: (C)
The SI unit of stress is –
(A) Pascal
(B) N/m
(C) kg/m²
(D) Watt
Answer: (A)
The rate of flow of heat depends on –
(A) Area
(B) Temperature difference
(C) Thickness
(D) All of the above
Answer: (D)
A manometer is used to measure –
(A) Atmospheric pressure
(B) Difference in pressure
(C) Temperature
(D) Acceleration
Answer: (B)
Escape velocity is independent of –
(A) Radius of planet
(B) Mass of planet
(C) Mass of object
(D) Gravitational acceleration
Answer: (C)
A ball in projectile motion has –
(A) Constant speed
(B) Uniform motion
(C) Constant horizontal velocity
(D) Constant vertical velocity
Answer: (C)
A Coulomb is equal to –
(A) 1 A·s
(B) 1 W·s
(C) 1 V·s
(D) 1 N·s
Answer: (A)
The unit of inductance is –
(A) Farad
(B) Henry
(C) Tesla
(D) Ohm
Answer: (B)
A virtual image is always –
(A) Inverted
(B) Real
(C) Upright
(D) Diminished
Answer: (C)
Sound waves cannot travel in –
(A) Steel
(B) Air
(C) Water
(D) Vacuum
Answer: (D)
The velocity of sound is greater in –
(A) Solid
(B) Liquid
(C) Gas
(D) Vacuum
Answer: (A)
A convex lens of focal length 20 cm has power –
(A) +2 D
(B) +5 D
(C) +10 D
(D) –5 D
Answer: (B)
The number of protons in an atom determines its –
(A) Isotope
(B) Atomic number
(C) Mass number
(D) Charge
Answer: (B)
Electric current in metals is due to –
(A) Free protons
(B) Ions
(C) Electrons
(D) Neutrons
Answer: (C)
The SI unit of angular momentum is –
(A) kg·m²/s
(B) kg·m/s²
(C) N·m
(D) m²/s²
Answer: (A)
The time period of a pendulum increases when –
(A) Mass increases
(B) Amplitude increases
(C) Length increases
(D) Gravity increases
Answer: (C)
A rainbow is due to –
(A) Reflection
(B) Refraction
(C) Dispersion
(D) All of the above
Answer: (D)
A magnetic compass shows –
(A) Latitude
(B) Magnetic North
(C) True North
(D) Altitude
Answer: (B)
A liquid rises in a capillary tube due to –
(A) Adhesion > cohesion
(B) Cohesion > adhesion
(C) Viscosity
(D) Gravity
Answer: (A)
The least count of a meter scale is –
(A) 1 mm
(B) 0.5 mm
(C) 0.1 mm
(D) 1 cm
Answer: (A)
The gravitational potential energy is –
(A) Always positive
(B) Always zero
(C) Always negative
(D) Constant
Answer: (C)
Thermal radiation is best emitted by –
(A) White surface
(B) Black surface
(C) Polished surface
(D) Glass
Answer: (B)
Beta particles are –
(A) High-speed electrons
(B) Protons
(C) Neutrons
(D) Positrons
Answer: (A)
A sonar is used to –
(A) Communicate
(B) Detect underwater objects
(C) Detect magnetic fields
(D) Calculate heat
Answer: (B)
The SI unit of torque is –
(A) Nm
(B) N
(C) N/m
(D) J/s
Answer: (A)
The minimum mirror length required to see your full image is –
(A) Equal to your height
(B) Half your height
(C) Twice your height
(D) One-third your height
Answer: (B)
A moving charge produces –
(A) Electric field
(B) Magnetic field
(C) Both A and B
(D) No field
Answer: (C)
The motion of Earth around the sun is –
(A) Uniform motion
(B) Uniform acceleration
(C) Non-uniform circular motion
(D) Uniform circular motion
Answer: (C)
A light year is a unit of –
(A) Time
(B) Distance
(C) Intensity
(D) Wavelength
Answer: (B)