» CBSE Physics Solids and Semi-Conductor Devices Expected Questions : Unit XII : CBSE Sample Question Papers

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CBSE Physics Semi-Conductor Devices Expected Questions : Unit XI

[Short/V. Short Questions—1, 2 Marks Questions] 1. How does the conductivity of a semiconductor change with temperature ? Answer 2. In the following diagrams, indicate which of the diodes are forward biased and which are reverse biased ? Image Answer 3. Write the truth table for AND gate. Answer 4. In a circuit shown, a switch which is open represents logic state 0 and the switch is closed represents logic state 1. The lamp L is lit when output is in logic state 1. What type of gates are represented by circuits in (i) and (ii) ? Image Answer 5.

CBSE Physics Current Electricity Expected Questions : Unit II

Very Short Answer Type Question Q. 1. What is unit of charge ? Answer : Q. 2. What are units of potential and current ? Answer : Q. 3. A heavy current is passed through a wire, is it charged ? Answer : Q. 4. What is unit of resistance ? Define it. Answer : Q. 5. What are the factors upon which resistance of a conductor depends ? Answer : Q. 6. What is specific resistance, resistivity of a wire ? Is it more for thick or thin wire ? Answer :

CBSE Physics Previous Question Paper All India 1997

Q. 1. Give the ratio of velocities of light rays of wavelengths 4000 A and 8000 A in vacuum. Answer Q. 2. A student obtains resistances of 3, 4, 12 and 16 ohms using only two metallic resistance wires either separately or joined together. What is the value of resistance of each of these wires? Answer Q. 3. Define 'dielectric constant' of a medium in terms of force between electric charges. Answer Q. 4. The wavelengths of some of the spectral lines obtained in hydrogen spectrum are 9546 A, 6463 k and 1216 A. Which one of these wavelengths belongs to Lyman series? Answer Q. 5.

CBSE Physics Thermal and Chemical Effect Expected Questions for Quick Revision : Unit III

[Short and V/Short Answer Questions 1-2 marks] 1. State two factors on which temperature of inversion for a thermocouple depends. Answer 2. How is the electric conductivity of an electrolyte affected by increase in temperature ? Answer 3. Write the expression connecting the thermoelectric emf. of a thermocouple with temperature difference of its cold and hot junctions. Answer 4. Describe the term electrolysis. Give two factors which are responsible for lower electric conductivity of electrolytes than metals at room temperature. Answer 5. Current I flows through potential difference V across a conductor. What is the rate of production of

CBSE Physics Universe Expected Questions : Unit XIII

Short Answer Type Questions Q. 1. Name the nine plantes. Answer Q. 2. What is 1 AU ? Answer Q. 3. How were the crators caused on the surface of moon ? Answer Q. 4. What is albedo of a planet ? Answer Q. 5. State Hubble's law. Answer Q. 6. What is order of mass of Sun ? Answer Q. 7. What is Milky Way ? Answer Q. 8. How is brightness of star represented ? Answer Q. 9. What is the value of Solar Constant ? Answer Q. 10.