CBSE Class 12 Physics Communication Systems MCQs

Question : Communication is the process of(a) keeping in touch(b) exchange information(c) broad casting(d) entertainment by electronicsAnswer: B Question : Which of the following is the element of a communication system?(a) Transmitter (b) channel(c) Receiver …

CBSE Class 12 Physics Semiconductor Electronics Materials Devices and Simple Circuits MCQs

Question : The transistor are usually made of (a) metal oxides with high temperature coefficient of resistivity(b) metals with high temperature coefficient of resistivity(c) metals with low temperature coefficient of resistivity(d) semiconducting materials having low…

CBSE Class 12 Physics Nuclei MCQs

Question : The constituents of nucleus are (a) electrons and protons(b) protons and neutrons(c) neutrons and electrons(d) electrons, protons and neutrons Answer: B  Question : The radius of a nucleus is (a) directly proportional to its mass number(b) inversely proportional to…

CBSE Class 12 Physics Atoms MCQs

Question : According to classical theory, the path of an electron in Rutherford atomic model is(a) spiral (b) circular(c) parabolic(d) straight line Answer: A Question : Rutherford’s a-particle experiment showed that the atoms have(a) Proton (b) Nucleus(c) Neutron (d)…

CBSE Class 12 Physics Dual Nature of Radiation and Matter MCQs

Question : A strong argument for the particle nature of cathode rays is that they(a) produce fluoroscence(b) travel through vacuum(c) get deflected by electric and magnetic fields(d) cast shadow Answer: C Question : In an electron gun the control grid is given a negative…

CBSE Class 12 Physics Wave Optics MCQs

Question : Wavefront is the locus of all points, where the particles of the medium vibrate with the same(a) phase(b) amplitude(c) frequency (d) periodAnswer: A Question : A plane wave passes through a convex lens. The geometrical shape of the wavefront that emerges is(a) plane…

CBSE Class 12 Physics Ray Optics and Optical Instruments MCQs

Question : The light reflected by a plane mirror may form a real image (a) if the rays incident on the mirror are diverging(b) if the rays incident on the mirror are converging(c) if the object is placed very close to the mirror(d) under no circumstances Answer: B Question :…

CBSE Class 12 Physics Electromagnetic Waves MCQs

Question: The electromagnetic waves do not transport (a) energy (b) charge(c) momentum (d) information Answer: B Question: The polarisation of electromagnetic wave is in(a) the directions of electric and magnetic field(b) the directions of electric field(c) the direction of…

CBSE Class 12 Physics Alternating Current MCQs

Question: Alternating current cannot be measured by D.C. ammeter, because (a) A. C. is virtual(b) A. C. changes its direction(c) A. C. cannot pass through D.C. ammeter(d) average value of A. C for complete cycle is zero Answer: D   Question: A.C. power is transmitted from a…

CBSE Class 12 Physics Electromagnetic Induction MCQs

Question: Whenever the magnetic flux linked with an electric circuit changes, an emf is induced in the circuit. This is called(a) electromagnetic induction(b) lenz’s law(c) hysteresis loss(d) kirchhoff’s lawsAnswer: A Question: According to Faraday’s law of electromagnetic…

CBSE Class 12 Physics Magnetism and Matter MCQs

Question: The magnetic field of the earth can be modelled by that of a point dipole placed at the centre of the earth. The dipole axis makes an angle of 11.3° with the axis of the earth. At Mumbai, declination is nearly zero. Then,(a) the declination varies between 11.3° W to…

CBSE Class 12 Physics Moving Charges and Magnetism MCQs

Question:  Biot-Savart law indicates that the moving electrons (velocity v) produce a magnetic field B such that(a) B is perpendicular of(b) B is parallel to v(c) it obeys inverse cube law(d) it is along the line joining the electron and point of observationt Answer: A  …

CBSE Class 12 Physics Current Electricity MCQs

Question: The cold junction of a thermocouple is maintained at 10ºC. No thermo e.m.f. is developed when the hot junction is maintained at 530ºC. The neutral temperature is(a) 260ºC(b) 265ºC(c) 270ºC(d) 520ºC Answer: C Question: Consider a current carrying wire (current I) in…

CBSE Class 12 Physics Electrostatic Potential and Capacitance MCQs

Question: A positively charged particle is released from rest in an uniform electric field. The electric potential energy of the charge(a) remains a constant because the electric field is uniform(b) increases because the charge moves along the electric field(c) decreases…