CUET Questions — Physics

A bus passes two persons moving in the direction of the moving bus at a speed of 3 km/hr and 5 km/hr, respectively. The bus passes the first person in 10 s and the second person in 11 s. Find the spee

Q27. Heavy water and ___________ is one of the substances used as moderator in reactors. (a) Sea water (b) Titanium (c) Graphite (d) Cobalt

Q6. A square shaped wire loop of side L is carrying a current I. What is the magnetic field at the point of intersection of diagonals of the square wire loop? (α) μοι πι√2 2√2 μοι (b) πι (c) 201 πι √2

Q31. A potential difference of 3 V is applied across a conductor of resistance 1.5 Ω. The number of electrons flowing through it in one second would be: (Given charge of an electron: e = 1.6 × 10⁻¹⁹ C

Q8. The shortest wavelength present in the Lyman series of spectral lines is: (Given Rydberg constant R = 1.097 x 107 m¯¹) (a) 9.1 x 10-8 m (b) 1.2 x 10-7 m (c) 8.2 x 107 m (d) 9.1 x 108 m

Q20. Which of the following causes electric conduction in a semiconductor? (a) Holes only (b) Electrons only (c) Both electrons and holes (d) Neither holes nor electrons

Q37. The capacitance of a capacitor becomes 7/6 times its original value if a dielectric slab of thickness t = 3/4 d is introduced in between the plates: where d is the separation between the plates.

Q21. Three circuits are shown below in which same alternating current is flowing. What will be the effect on currents in three cases respectively if frequency of alternating emf be increased? (i) [Cir

Q37. Light of two different frequencies whose photons have energies 1 eV and 2.5 eV respectively, illuminate a metal of work function 0.5 eV. The ratio of the maximum KE of the emitted electrons will

Q25. A uniformly charged conducting sphere of radius 1.3 m has a surface charge density of 70 µC m-2. What is the total electric flux leaving the surface of the sphere? (a) 5.9 x 108 N m² C-1 (b) 1.7