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Current Electricity MCQ for NEET. We covered all the Current Electricity MCQ for NEET in this post for free so that you can practice well for the exam.
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MCQ on Current Electricity for NEET Students
Given a human eye with a pupil radius of 3 mm and a viewing distance of 25 cm, what is the smallest distance between two points that can be distinguished at a light wavelength of 550 nm?
a) 3 μm
b) 28 μm
c) 100 μm
d) 300 μm
Option b – 28 μm
In polar regions, the image of a ship appears above the actual ship due to:
a) Light dispersion
b) Warmer air near the surface compared to upper layers
c) Cooler air near the surface compared to upper layers
d) Temperature being higher than the critical value
Option c – Cooler air near the surface compared to upper layers
A compound microscope uses lenses with focal lengths of 1.6 cm and 4.25 cm. An object is positioned 2.4 cm from the objective, and the final image is seen 25 cm from the eye lens. Find the lens separation.
a) 8.4 cm
b) 7.75 cm
c) 9.25 cm
d) 11.00 cm
Option a – 8.4 cm
If magnification is greater than 1 and negative, it indicates:
a) Object at infinity, image at focus of convex lens
b) Object at infinity, image at focus of concave lens
c) Object between optical center and focus, image beyond focus for convex lens
d) Object between focus and 2f, image beyond 2f for convex lens
Option d – Object between focus and 2f, image beyond 2f for convex lens
In a Nicol prism, when the angle of incidence exceeds the critical angle, which type of ray is internally reflected?
a) Ordinary ray
b) Extraordinary ray
c) Polarized ray
d) Linearly polarized ray
Option a – Ordinary ray
In which part of the electromagnetic spectrum is diffraction most easily observed?
a) X-rays
b) Blue light
c) Red light
d) Radio waves
Option d – Radio waves
A ray deviates away from the base of a glass prism. The prism is placed in:
a) Air
b) Vacuum
c) Water
d) Carbon disulphide
Option d – Carbon disulphide
Assertion: UV light is used to verify counterfeit currency.
Reason: Genuine notes glow under ultraviolet light.
a) Both assertion and reason are true; reason explains the assertion
b) Both assertion and reason are true; reason does not explain the assertion
c) Assertion is true; reason is false
d) Both assertion and reason are false
Option c – Assertion is true; reason is false
A swimmer finds it hard to see clearly under water despite the water being clean. This is because of:
a) Light absorption
b) Light scattering
c) Slower light speed in water
d) Change in the eye lens focal length
Option d – Change in the eye lens focal length
A convex lens of 10 cm focal length is aligned with a convex mirror (R = 20 cm), and both are 15 cm apart. If a point object is placed 15 cm in front of the lens, where is the final image?
a) 80 cm from lens
b) 45 cm from lens
c) 15 cm from mirror pole
d) 45 cm from mirror pole
Option b – 45 cm from lens
In frequency modulation, which property of the carrier wave remains unchanged?
a) Frequency
b) Amplitude
c) Frequency and amplitude
d) Frequency and phase
Option b – Amplitude
A light ray enters a glass sphere with a diameter of 20 cm and refractive index 1.5. At what distance from the center does the ray meet the axis?
a) 7.5 cm
b) 15 cm
c) 22.5 cm
d) 30 cm
Option b – 15 cm
Two identical equiconvex lenses with 0.4 m focal length are placed 0.4 m apart. The effective focal length of the system is:
a) –0.4 m
b) 0.4 m
c) –0.1 m
d) 0.1 m
Option b – 0.4 m
In communication systems, noise usually impacts the signal:
a) At the transmitter
b) In the transmission channel
c) At the signal source
d) At the receiver
Option b – In the transmission channel
Dissociating a hydrogen iodide molecule requires about 3.1 eV. The minimum frequency of electromagnetic radiation needed falls in:
a) Visible light
b) Infrared range
c) Ultraviolet range
d) Microwave range
Option a – Visible light
Why can radio waves bend around buildings while light cannot?
a) Radio waves move faster than light
b) Radio waves have much longer wavelengths than light
c) Radio waves are not transverse
d) Radio waves are not electromagnetic
Option b – Radio waves have much longer wavelengths than light
Assertion: At standard temperature and pressure, the critical angle for air is undefined.
Reason: Air is the least optically dense medium at S.T.P.
a) Both assertion and reason are true; reason explains the assertion
b) Both assertion and reason are true; reason does not explain the assertion
c) Assertion is true; reason is false
d) Both assertion and reason are false
Option d – Both assertion and reason are false
If a television broadcast covers a radius of 320 km, what is the height of the transmission antenna?
a) 1.25 km
b) 11.25 km
c) 8 km
d) 3.125 km
Option c – 8 km
The version of the signal received by the receiver is:
a) Exact copy
b) Inverted version
c) Distorted or corrupted
d) Periodic
Option c – Distorted or corrupted
Displacement current occurs across the capacitor plates when:
a) The capacitor is charging
b) The capacitor is discharging
c) Both charging and discharging
d) The capacitor is fully charged
Option c – Both charging and discharging
The sharpness of a diffraction pattern does not depend on:
a) Slit width
b) Number of slits
c) Slit length
d) None of the above
Option c – Slit length
Assertion: Changing the hole size in a pinhole setup alters the diffraction pattern’s intensity.
Reason: Intensity of diffraction is inversely related to hole size.
a) Both assertion and reason are true; reason explains the assertion
b) Both assertion and reason are true; reason does not explain the assertion
c) Assertion is true; reason is false
d) Assertion is false; reason is true
Option c – Assertion is true; reason is false
Which wave type disappears due to tilting?
a) Space waves
b) Microwaves
c) Skywaves
d) Surface waves
Option d – Surface waves
Two thin prisms are combined to achieve dispersion without deviation. Prism P₁ has an angle of 2° and refractive index 1.42. Prism P₂ is made of glass with refractive index 1.56. What is the angle of P₂?
a) 1.5°
b) 3°
c) 4°
d) 2.8°
Option a – 1.5°
Light of wavelength 6400 Å passes through a slit 1 mm wide, producing a diffraction pattern on a screen 150 cm away. What is the distance between the two first minima on either side of the central bright fringe?
a) 1.92 mm
b) 1.27 mm
c) 2.532 mm
d) 2.14 mm
Option a – 1.92 mm
Which method can be used to detect ultraviolet radiation?
a) Photographic plates
b) Photoelectric cells
c) Fluorescence
d) All of the above
Option d – All of the above
Optical fibres work based on which condition related to incident light?
a) Incident angle is more than the critical angle for the core
b) Incident angle is less than the critical angle for the core
c) Incident angle is greater than the critical angle between the core and cladding
d) Incident angle is below 90°
Option c – Incident angle is greater than the critical angle between the core and cladding
A 60 W light bulb operates with 5% efficiency. What is the peak electric field of its radiation measured at 4 meters away?
a) 1.68 V/m
b) 2.27 V/m
c) 3.35 V/m
d) 4.2 V/m
Option c – 3.35 V/m
Two convex lenses with focal lengths 2 m and 1 m are placed 4 m apart. An object is positioned 4 m from the first lens. What is the distance of the final image from the object?
a) 7.0 m
b) 8.5 m
c) 6.0 m
d) 6.5 m
Option b – 8.5 m
What determines the quality and strength of a signal in transmission?
a) Attenuator
b) Modulation index
c) Amplifier
d) All of the above
Option b – Modulation index
When is geometrical optics a valid approximation if aperture size is 2 mm and light wavelength is 600 nm? ( Current Electricity MCQ for NEET Students )
a) 2.4 m
b) 4.92 m
c) 6.67 m
d) 7.30 m
Option c – 6.67 m
A prism has a minimum deviation angle equal to its prism angle, and its refractive index is 1.5. What is the angle of the prism? (Given: sin 48°36′ = 0.75)
a) 41°24′
b) 48°36′
c) 60°
d) 82°48′
Option d – 82°48′
A 90 MHz carrier is modulated using a 300 Hz sine wave, producing a frequency deviation of 30 kHz. If the carrier voltage is 4 V, what is the modulation index?
a) 25
b) 50
c) 100
d) 500
Option c – 100
An electron moves eastward in a region with a magnetic field pointing north. What is the direction of the magnetic force on the electron? ( Current Electricity MCQ for NEET Students )
a) Upward
b) Eastward
c) Downward
d) Northward
Option c – Downward
Which rule determines the direction of force on a current-carrying conductor in a magnetic field?
a) Fleming’s left-hand rule
b) Fleming’s right-hand rule
c) Right-hand thumb rule
d) Left-hand thumb rule
Option a – Fleming’s left-hand rule
Which rule indicates the direction of an induced current?
a) Fleming’s right-hand rule
b) Fleming’s left-hand rule
c) Right-hand thumb rule
d) Left-hand thumb rule
Option a – Fleming’s right-hand rule
Electrical switches are usually connected to which wire? ( Current Electricity MCQ for NEET Students )
a) Live wire
b) Neutral wire
c) Earth wire
d) Any of the above
Option a – Live wire
What is the most commonly used device to prevent damage from overloading or short circuits? ( Current Electricity MCQ for NEET Students )
a) Earthing
b) Stabilizer
c) Fuse
d) Electric meter
Option c – Fuse
Choose the correct statement(s): (i) Discharge lamps use low-pressure gas-filled tubes. (ii) Light emitted from discharge lamps is always white regardless of the gas.
a) Only (i) is correct
b) Only (ii) is correct
c) Both (i) and (ii) are correct
d) Both (i) and (ii) are incorrect
Option a – Only (i) is correct
Two identical spheres carry charges of -5 C and -16 C respectively. Which is at a higher electric potential?
a) -5 C
b) -16 C
c) Both have same potential
d) Cannot be determined
Option a – -5 C
Where is the magnetic field strongest in a bar magnet? ( Current Electricity MCQ for NEET Students )
a) Centre
b) North pole
c) South pole
d) At both poles
Option d – At both poles
Which material is ideal for making the core of a strong electromagnet?
a) Aluminium
b) Soft iron
c) Copper
d) Steel
Option b – Soft iron
Inside a current-carrying solenoid, the magnetic field lines are:
a) Perpendicular to the axis
b) Along the axis and parallel to each other
c) Parallel inside and circular near the ends
d) Circular
Option c – Parallel inside and circular near the ends
What happens to the magnetic field when a soft iron bar is inserted into a solenoid?
a) It becomes zero
b) It increases
c) It decreases
d) It remains unchanged
Option b – It increases
An electric generator functions as: ( Current Electricity MCQ for NEET Students )
a) A source of electric charge
c) An electromagnet
d) A device that converts energy
Option d – A device that converts energy
The flow of conventional current is from:
a) Negative to positive
b) Positive to negative
c) Either direction
d) Both directions
Option b – Positive to negative
Which material is best suited as a core for an electromagnet?
a) Soft iron
b) Hard iron
c) Rusted iron
d) None of these
Option a – Soft iron
Who proposed the Right-hand Thumb Rule? ( Current Electricity MCQ for NEET Students )
a) Oersted
b) Fleming
c) Einstein
d) Maxwell
Option d – Maxwell
Which instrument is used to detect current in a circuit?
a) Galvanometer
b) Motor
c) Generator
d) None
Option a – Galvanometer
Which device is designed to produce electric current?
a) Generator
b) Galvanometer
c) Ammeter
d) Motor
Option a – Generator
The best material to manufacture permanent magnets is:
a) Aluminium
b) Soft iron
c) Copper
d) Alnico
Option d – Alnico
Magnetic field lines originate from: ( Current Electricity MCQ for NEET Students )
a) North pole and end at South pole
b) South pole and end at North pole
c) Centre to North pole
d) Centre to South pole
Option a – North pole and end at South pole
A current that alternates from zero to peak and reverses direction is called:
a) Direct current
c) Pulsating current
d) None of the above
Option b – Alternating current
What flows through an earth wire under normal conditions?
a) Current
b) Voltage
c) No current
d) Heat
Option c – No current
What is a key advantage of using AC over DC for long-distance power transmission?
a) Minimal energy loss during transmission
b) Fewer insulation issues
c) More stability
d) Easy to transform voltage
Option a – Minimal energy loss during transmission
What are essential properties of a fuse wire? ( Current Electricity MCQ for NEET Students )
a) High conductivity
b) Low melting point
c) Resistance to oxidation
d) All of the above
Option d – All of the above
Overloading can occur due to:
a) Damaged insulation
b) Appliance faults
c) Sudden voltage surges
d) All of the above
Option d – All of the above
Which method is widely used to protect appliances from overload and short circuit? ( Current Electricity MCQ for NEET Students )
a) Earthing
b) Fuse
c) Stabilizer
d) Electric meter
Option b – Fuse
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