List of top Questions asked in CUET (UG)

Two charges 5 µC and -2 µC (with no external field) are placed at (-9 cm, 0, 0) and (9 cm, 0, 0) respectively. The work required to separate the two charges infinitely away from each other is :

An infinite line charge produces an electric field of 9 × 10⁶ N/C at a distance of 20 cm. The linear charge density will be :

When a ray of light enters from denser medium to rarer medium, its velocity is doubled. The critical angle for total internal reflection will be:

Which of the following is/are responsible for the formation of Rainbow?
(A) Dispersion of light
(B) Interference of light
(C) Reflection of light
(D) Refraction of light
Choose the correct answer from the options given below:

The shape of graph between 1/u and 1/v in case of a convex lens is:

At what speed should a galaxy move with respect to earth so that spectral line of 600.0 nm appears as 600.6 nm?

Let us consider interference between two sources of intensities I and 4I. What will be the intensity at points where the phase difference is π?

Two polaroid P₁ and P₃ are placed such that their pass-axis are mutually perpendicular. Another polaroid P₂ is rotated between P₁ and P₃. For what angle θ between P₁ and P₂ the intensity of light emerging from P₃ will be maximum?

The graph showing correct variation of photo current with intensity of incident light:

Electron and Photon have same de Broglie wavelength, which of the following is true for their momentum:

Which of the following graph correctly shows the relation between photoelectric current (I) and wavelength (λ) of incident radiation

Consider two different hydrogen atoms. The electron in each atom is in first excited state. According to Bohr's model, electrons will have:

Choose the correct statements:
(A) A nuclide is represented as \(^Z_AX\)
(B) Nuclids with same number of protons are called isotopes
(C) a-ray scattering experiments allow determination of the nuclear radius
(D) Nuclids with same number of neutrons are called isotones
(E) The nuclear force distinguishes between neutron and proton
Choose the correct answer from the options given below:

Match List I with List II

List-I		List-II
(A)	To slow down fast moving neutrons	(I)	Thermal neutrons
(B)	A neutron or a proton	(II)	Fission
(C)	Slow neutrons	(III)	Moderator
(D)	Neutron induced nuclear reaction	(IV)	Nucleon

Choose the correct answer from the options given below:

A radioactive isotope phosphorous-32 has an initial activity 10μCi and has half life of 14 days. What is the activity of the source after 42 days?

Energy band gap is maximum in:

The forbidden energy gaps in conductors, semiconductors and insulators are (E_g)_c, (E_g)_s and (E_g)₁ respectively. What is the relation among them ?

Which of the following statements are correct for a transistor action ?
(A) The input resistance depends upon the current I_C in the transistor
(B) Collector currents is equal to the sum of base current and emitter current
(C) The emitter junction is forward biased
(D) The collector junction is reverse biased
(E) Both the emitter junction as well as the collector junction are forward biased
Choose the correct answer from the options given below:

The logic gate realised using p-n junction diodes in the given figure is:

Which of the following is a transducer ?
(A) Loudspeaker
(B) Amplifier
(C) Rectifier
(D) Microphone
Choose the correct answer from the options given below :

The correct mathematical expression for amplitude modulated wave is:

A vertical electric field of magnitude 4.9×10⁵ NC^-1 just prevents a water droplet of mass 0.1 g from falling. What is the charge on the droplet? Take acceleration due to gravity 9.8 ms^-2.

Which of the following statements are correct?
(A) The resistivity of a semiconductor decreases with increasing temperature.
(B) The potentiometer is unaffected by the internal resistance of the source.
(C) In ionic crystals and electrolytic liquids electrons carry the electric current.
(D) Ohm's law fails if V depends on I non-linearly.
(E) Kirchhoff's rules are used for analysis of electric circuits.
Choose the correct answer from the options given below:

For a medium with permittivity (e) and permeability (µ), the speed of light (v) is given by:

A parallel beam of monochromatic light of wavelength 460 nm passes through a long slit of width 0.1 mm. What is the angular divergence in which most of the light is diffracted?