Atoms Objective Questions The first model of atom in 1898 was proposed by (a) Ernst Rutherford (b) Albert Einstein (c) J.J. Thomson (d) Niels Bohr Answer: (c) J.J. Thomson In Geiger-Marsden scattering experiment, the trajectory traced by an a-particle depends on (a) number of collision (b) number of scattered a-particles (c) impact parameter (d) none […]
Physics Class 12
Physics class 12 chapter 11 Objective Questions
Dual Nature of Radiation and Matter Objective Who established that electric charge is quantised? (a) J.J. Thomson (b) William Crookes (c) R.A. Millikan (d) Wilhelm Rontgen Answer: (c) R.A. Millikan Cathode rays were discovered by (a) Maxwell Clerk James (b) Heinrich Hertz (c) William Crookes (d) J.J. Thomson Answer: (c) William Crookes The minimum energy […]
Physics class 12 chapter 10 Objective Questions
Wave Optics Objective Questions The idea of secondary wavelets for the. propagation of a wave was first given by (A) Newton (B) Huygens (C) Maxwell (D) Fresnel Answer: (B) Huygens Light propagates rectilinearly, due to (A) wave nature (B) wavelengths (C) velocity (D) frequency Answer: (A) wave nature Which of the following is correct for […]
12th Physics chapter 9 Objective Questions
Ray Optics and Optical Instruments Objective For a total internal reflection, which of the following is correct? (a) Light travels from rarer to denser medium. (b) Light travels from denser to rarer medium. (c) Light travels in air only. (d) Light travels in water only. Answer: (b) Light travels from denser to rarer medium. Critical […]
Physics class 12 chapter 8 Objective Questions
Electromagnetic Waves Objective Maxwell in his famous equations of electromagnetism introduced the concept of (a) ac current (b) displacement current (c) impedance (d) reactance Answer: (b) displacement current The conduction current is same as displacement current when source is (a) ac only (b) dc only (c) either ac or dc (d) neither dc nor ac […]
Physics class 12 chapter 7 Objective Questions
Alternating Current Objective Alternating voltage (V) is represented by the equation (a) V(t) = Vm eωt (b) V(t) = Vm sin ωt (c) V(t) = Vm cot ωt (d) V(t) = Vm tan ωt Answer: (b) V(t) = Vm sin ωt In the case of an inductor (a) voltage lags the current by π/2 (b) voltage leads the current by π/2 (c) […]
Physics class 12 chapter 6 Objective Questions
Electromagnetic Induction Objective The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a short galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when […]
Physics class 12 chapter 5 Objective Questions
Magnetism and Matter Objective Questions The earth behaves as a magnet with magnetic field pointing approximately from the geographic (a) North to South (b) South to North (c) East to West (d) West to East Answer: (b) South to North The strength of the earth’s magnetic field is (a) constant everywhere. (b) zero everywhere. (c) […]
Physics class 12 chapter 4 Objective Questions
Moving Charges and Magnetism Objective Questions A charged particle is moving in a cyclotron, what effect on the radius of path of this charged particle will occur when the frequency of the ratio frequency field is doubled? (a) It will also be doubled. (b) It will be halved. (c) It will be increased by four […]
Physics class 12 chapter 3 Objective Questions
Current Electricity Objective Questions An electric heater is connected to the voltage supply. After few seconds, current gets its steady value then its initial current will be (a) equal to its steady current (b) slightly higher than its steady current (c) slightly less than its steady current (d) zero Answer: (b) slightly higher than its […]