» CBSE Physics Atom, Nucleus, Nuclear Energy Expected Questions : Unit XI : CBSE Sample Question Papers

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CBSE Physics Atom, Molecule, Nuclei Expected Questions : Unit X

[Short/Very Short Answer Questions-1, 2 Marks] 1. Name the series of hydrogen spectrum lying in ultraviolet region. Answer 2. The total energy of an electron in the first excited state of the hydrogen atom is about —3.4eV. What is the P.E. of the electron in this state ? Answer 3. What is Bohr's quantisation condition for angular momentum of an electron in the second orbit ? Answer 4. What is a-particle ? In the reaction zXA = a + Y, give the atomic number and mass number ofY. Answer 5. What is beta decay ? Give one

CBSE Physics Electrons and Photons Expected Questions : Unit IX

[Short/Very Short Questions-1-2 Marks) 1. Intensity of incident radiation on a metal is doubled, what happens to kinetic energy of electrons emitted ? Answer 2. Calculate de Broglie wavelength of a body of mass 3 kg moving at 5 ms-1 Answer 3. What is the main features of a metal used for photoelectric emission ? Answer 4. Why de-Broglie wavelength of a mass on the earth is not noticeable ? Answer 5. The de-Broglie wavelength of a photon and an electron are the same. Which of the two has greater energy ? Answer 6. What happens to the velocity of the

CBSE Physics Sample Question Paper : Set-9

Q. 1. Mention two defects of a simple cell. Answer Q. 2. When are the voltage and current in a LCR series A.C. circuit in phase? Answer Q. 3. Why cannot two magnetic lines of forces due to a bar magnet cross each other? . Answer Q. 4. The magnetic flux threading a coil changes from 12 X 10-3 Wb to 7 X 10-3 Wb in 0.01 s. Calculate the induced e.m.f. Answer Q. 5. What are comets composed

CBSE Physics Magnetism Expected Questions : Unit V

(Short/V. Short Questions i.e. 1-2 Marks Questions) 1. Which direction would a compass point to if located right on the geometric north and south pole? Answer 2. Define neutral point. Write the positions of N.P. when a small bar magnet is placed with its north pole (i) towards north of the earth, (ii) towards south of the earth. Answer 3. What is the value of angle of dip at a place situated on the magnetic equator of the earth ? Answer 4. Define the term magnetic moment. Answer 5. Draw a diagram showing

CBSE Physics Electrostatics Expected Questions for Quick Revision : Unit I

Short/V. Short Questions i.e. 1-2 Marks Questions 1. Name two basic properties of electric charge. Answer : 2. The electric potential at 0 - 9 m from a point charge is + 50 V. Find the magnitude and nature of the charge. Answer : 3. Small ozone layer on the top of atmosphere is crucial for human survival. Why ? Answer : 4. Sketch lines of force due to point charges (i) q < 0 ; (ii) q > 0. Answer : 5. Define dielectric constant in terms of capacitance of a