List of top Questions asked in CUET (UG)- 2023

Consider two different hydrogen atoms. The electron in each atom is in first excited state. According to Bohr's model, electrons will have:
What is the self inductance of a solenoid of length 50 cm, if area of cross section is 10 cm2 and total number of turns is 600?
Two wires of copper have lengths L and 2L and cross sectional area 2A and A, respectively. The ratio of their specific resistance would be-
The coercivity of a bar magnet is 140 A m\(^{-1}\). To demagnetize it, it is placed inside a solenoid of length 1.6 m and number of turns 112. What is the current flowing through the solenoid?
Choose the correct formula for magnifying power of a simple microscope from the following
Which of the following statements are correct?
A. Number of photoelectrons emitted per second is directly proportional to the intensity of incident radiation
B. Cut off potential is the minimum negative potential given to the plate for which photocurrent becomes maximum
C. For a given frequency of the incident radiation, the stopping potential is independent of its intensity
D. Even for the exceedingly dim incident radiation apparent time lag is~ 109s or less
E. Photons are electrically neutral and are not deflected by electric and magnetic fields
Choose the correct answer from the options given below:
At what distance should an object be placed from a convex lens of focal length 15 cm to obtain a real image three times the size of the object?
Two protons P and Q are placed between two charged plates A and B as shown, then
2 protons
Two point charges \(q\) and \(-3q\) are kept 12 cm apart. The distance of the point from \(q\) on the line between two charges at which potential due to this system of charges is zero will be:
When someone punches a wall, there is no visible effect upon it. This example can be used to teach?
(1) Law of conservation of energy can be violated in specific cases 
(2) Law of conservation of energy can never be violated. 
(3) Sometimes energy is invisible and needs to be visualised. 
(4) Sometimes there is no effect of force on energy.
The boiling point of water _______
One light year is equals to______.
A spherical air lens of radii \( R_1 = R_2 = 10 \, \text{cm} \) is cut from a glass (\(\mu = 1.5\)) cylinder as shown in the figure. Its focal length is \( f_1 \). If a liquid of refractive index \( \mu_2 \) is filled in the space, then the focal length of the liquid lens becomes \( f_2 \). Calculate \( f_1 \) and \( f_2 \). Choose the correct options from the following.
spherical air lens of radii R1 = R2 = 10
The potential of a uniformly charged spherical shell at a point r/2 from its centre is 5 V. The potential at its surface is:
(Given radius of shell = r)
The magnitude of electric current is increasing from A towards B. If there is any induced current in the loop as shown in the figure, its direction will be:
magnitude of electric current is increasing from A towards B
Which of the following statement is not true for the electromagnetic waves?
Three capacitors of capacitances 3 \(\mu\)F, 6 \(\mu\)F and 12 \(\mu\)F are connected in series. Find the potential difference across the 6 \(\mu\)F capacitor, if a battery of 7 V is connected across this combination:
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?
Electron and Photon have same de Broglie wavelength, which of the following is true for their momentum:
In an a.c. circuit, the rms voltage is \(100\sqrt{2}\) V. The peak value of voltage would be:
A semiconductor has an electron concentration of 8 x 1013 m-3 and hole concentration of 2 × 103 m-3. The semiconductor behaves as:
An alternating voltage V = 140 sin 100 πt is connected across a pure resistor of resistance 40 Ω. What is the rms current through the resistor? (Take √2 = 1.4)
Which of the following is a transducer ?
(A) Loudspeaker
(B) Amplifier
(C) Rectifier
(D) Microphone
Choose the correct answer from the options given below :
Energy band gap is maximum in:
After 4 hours,\(\frac{1}{16}\) of the initial amount of a certain radioactive isotype remains undecayed. What is the half life of the isotope?