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
Assuming the human pupil to have a radius of 3 mm and a comfortable viewing distance of 25 cm, the minimum separation between two objects that the human eye can resolve at 550 nm wavelength is
(A) 3 μm
(B) 28 µm
(C) 100 μm
(D) 300 µm
Option b – 28 µm
In a polar region, the image of a ship is seen above the ship itself. This is due to
(A) dispersion of light.
(B) lower layers of air are warmer than the upper layers.
(C) lower layers of air are cooler than the upper layers.
(D) temperature is higher than the critical temperature.
Option c – lower layers of air are cooler than the upper layers.
In a compound microscope, the focal lengths of two lenses are 1.6 cm and 4.25 cm. An object is placed 2.4 cm from the objective and the final image is formed 25 cm from the eye lens. The distance between the two lenses is
(A) 8.4 cm
(B) 7.75 cm
(C) 9.25 cm
(D) 11.00 cm
Option a – 8.4 cm
When the magnitude of magnification is >1 and the sign is negative it means,
(A) the object is at infinity, and the image is at a focus for a convex lens.
(B) the object is at infinity, the image at a focus for a concave lens.
(C) the object between the optical center and focus, image beyond f for a convex lens.
(D) the object between f and 2f, and the image beyond 2f for a convex lens.
Option d – the object between f and 2f, and the image beyond 2f for a convex lens.
For an incidence angle greater than critical angle transmission which ray gets reflected inside a Nicol prism?
(A) Ordinary ray
(B) Extraordinary ray
(C) Polarized ray
(D) Linearly polarized ray
Option a – Ordinary ray
For which region of electromagnetic spectrum diffraction is observed most readily?
(A) X-rays
(B) Blue light
(C) Red light
(D) Radio waves
Option d – Radio waves
A ray incident on a glass prism deviates away from the base of the prism. Prism is placed in ……….
(A) air
(B) vacuum
(C) water
(D) carbon disulphide
Option d – carbon disulphide
Assertion: Ultraviolet rays are used to detect forged bank notes. Reason: Real bank notes fluoresce in UV light.
(A) The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
(B) The assertion is True, and Reason is True; Reason is not a correct explanation for assertion.
(C) The assertion is True, Reason is False.
(D) The assertion is False, Reason is False.
Option c – The assertion is True, Reason is False.
An underwater swimmer cannot see very clearly even in crystal clear water due to ………
(A) absorption of light in water
(B) scattering of light in water
(C) reduction of speed of light in water
(D) change in the focal length of the eye lens.
Option d – change in the focal length of the eye lens.
A convex lens of focal length 10 cm is placed co-axially with a convex mirror of radius of curvature 20 cm. The two are kept 15 cm apart from each other. A point object is placed 15 cm in front of the convex lens. The image formed by the combination will be at a distance
(A) 80 cm from the optic center of the lens.
(B) 45 cm from the optic center of the lens.
(C) 15 cm from the pole of the mirror.
(D) 45 cm from the pole of the mirror.
Option b – 45 cm from the optic center of the lens.
In frequency modulation ………. of carrier wave remain/s constant.
(A) frequency
(B) amplitude
(C) frequency and amplitude
(D) frequency and phase
Option b – amplitude
A ray enters a glass globe parallel to its axis. If the globe has a diameter of 20 cm and a refractive index of 1.5, at what distance from the center of the globe will the ray cross its axis?
(A) 7.5 cm
(B) 15 cm
(C) 22.5 cm
(D) 30 cm
Option b – 15 cm
Two thin equiconvex lenses each of focal length 0.4 m are placed coaxially with their optic centers 0.4 m apart. Then the focal length of the combination is
(A) – 0.4 m
(B) 0.4 m
(C) – 0.1 m
(D) 0.1 m
Option b – 0.4 m
In a communication system, noise is most likely to affect the signal ……….
(A) at the transmitter
(B) in the channel or in the transmission line
(C) in the information source
(D) at the receiver
Option b – in the channel or in the transmission line
One requires around 3.1 eV of energy to dissociate a hydrogen iodide molecule into hydrogen and iodine atoms. The minimum frequency of the appropriate electromagnetic radiation to achieve dissociation lies in
(A) the visible region.
(B) infrared region.
(C) ultraviolet region.
(D) microwave region.
Option a – the visible region.
Radio waves diffract around buildings although light waves do not. The reason is that radio waves
(A) travel with a speed greater than c.
(B) have a much greater wavelength than light.
(C) are not transverse in nature.
(D) are not electromagnetic waves.
Option b – have a much greater wavelength than light.
Assertion: Critical angle for air at S.T.P. is not defined. Reason: Air at S.T.P. is optically the rarest medium.
(A) Assertion is True, Reason is True; Reason is a correct explanation for Assertion.
(B) Assertion is True, Reason is True; Reason is not a correct explanation for Assertion.
(C) Assertion is True, Reason is False.
(D) Assertion is False, Reason is False.
Option d – Assertion is False, Reason is False.
What is the height of the transmitting antenna if the T.V. telecast covers a radius of 320 km?
(A) 1.25 km
(B) 11.25 km
(C) 8 km
(D) 3.125 km
Option c – 8 km
The receiver receives ……… version of the transmitted signal.
(A) exact
(B) inverted
(C) corrupted
(D) periodic
Option c – corrupted
Displacement current goes through the gap between the plates of the capacitor when
(A) the capacitor is changing.
(B) the capacitor is discharging.
(C) (A) and the (B)
(D) the capacitor is fully charged.
Option c – (A) and the (B)
The fineness of the diffraction pattern is independent of ……..
(A) slit width
(B) number of slits
(C) length of slit
(D) none of the above
Option c – length of slit
Assertion: In obtaining a diffraction pattern from a change in the size of the hole causes a change pinhole, in the intensity of the diffraction pattern. Reason: The intensity of the diffraction pattern is inversely proportional to the size of the hole.
(A) The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
(B) The assertion is True, and Reason is True; Reason is not a correct explanation for Assertion.
(C) The assertion is True, Reason is False.
(D) The assertion is False, Reason is True.
Option c – The assertion is True, Reason is False.
Which of the following waves disappear because of tilting?
(A) Space waves
(B) Microwaves
(C) Skywaves
(D) Surface waves
Option d – Surface waves
A thin prism P₁ with a prism angle of 2° and made from glass of refractive index 1.42 is combined with another thin prism P₂ made from glass of refractive index 1.56 to produce dispersion without deviation. What is the angle of the prism P₂?
(A) 1.5°
(B) 3°
(C) 4°
(D) 2.8°
Option a – 1.5°
Through a narrow slit of width 1 mm, a diffraction pattern is formed on a screen kept at a distance of 150 cm from the slit. The wavelength of the light used is 6400 Å and falls normally to the slit and screen. Then the distance between the two minima on either side of the central maximum is
(A) 1.92 mm
(B) 1.27 mm
(C) 2.532 mm
(D) 2.14 mm
Option a – 1.92 mm
UV radiation can be detected by ……… ( Current Electricity MCQ for NEET )
(A) photographic plates
(B) photoelectric cells
(C) fluorescence
(D) all of the above
Option d – all of the above
Optical fibers operate on the condition that the angle of incidence of light
(A) is greater than the critical angle for fiber material with respect to the core.
(B) is smaller than the critical angle for fiber material with respect to the core.
(C) is greater than the critical angle for fiber material with respect to cladding.
(D) is lesser than 90°.
Option c – is greater than the critical angle for fiber material with respect to cladding.
A 60 W bulb has an efficiency of 5%. The peak value of the electric field produced by its radiation at a distance of 4 m is
(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
An object is located 4 m from the first of two thin converging lenses of focal lengths 2 m and 1 m respectively. The lenses are separated by 4 m. The final image formed by the second lens is located from the source at a distance of
(A) 7.0 m
(B) 8.5 m
(C) 6.0 m
(D) 6.5 m
Option b – 8.5 m
The strength and quality of the transmitted signal are determined by ( Current Electricity MCQ for NEET )
(A) attenuator.
(B) modulation index.
(C) amplifier
(D) all of the above.
Option b – modulation index.
For what distance is ray optics a good approximation when the aperture is 2 mm and the wavelength of light is 600 nm?
(A) 2.4 m
(B) 4.92 m
(C) 6.67 m
(D) 7.30 m
Option c – 6.67 m
The angle of minimum deviation for a prism of refractive index 1.5 is equal to the angle of the prism of the given prism. Then the angle of prism is ……….. (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 by a 300 Hz sine wave. The carrier voltage is 4 V and the frequency deviation is 30 kHz. Then, the modulation index is
(A) 25
(B) 50
(C) 100
(D) 500
Option c – 100
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