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5 Marks Questions [Long Answer Type]
1. What are Kirchhoff s laws ? Apply them to determine the conditions of a balanced Wheat Stone’s bridge.
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2. Three cells are arranged in parallel with like poles connected together with wires of negligible resistance. If the e.m.f. of the cells are 2,1 and 4 V respectively and their internal reistances are 4 Ω, 3 Ω and 2 Ω respectively. Calculate the current through each cell.
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3. Two cells of e.m.f. 1-5 V and 2-0 V and internal resistances 1Q and 2 Q respectively are connected in parallel so as to the current in the same direction through an external resistance of 5 Ω..
(i) Draw the circuit diagram.
(ii) Using Kirchhoffs laws calculate (a) current through each branch ; (b) P.D. across 5 Q resistance.
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Related CBSE Information
[Short and V/Short Answer Questions 1-2 marks]
1. State two factors on which temperature of inversion for a thermocouple depends.
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2. How is the electric conductivity of an electrolyte affected by increase in temperature ?
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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
Short/V. Short Answer Questions 1-2 Marks Each
1. A current is set up in a long copper pipe. Is there a magnetic field (i) inside ; (ii) outside the
pipe ?
Answer
2. Consider the circuit shown where APB and AQB are semicircles. What will be the mag¬netic field at the centre C of a circular loop ?
Answer
3. Under what conditions the force acting on a charge moving through a uniform magnetic field., minimum ?
Answer
4. What will be the path of a charged particle moving along the direction of a uniform magnetic field?
Answer
5. An
Short/V. Short Questions i.e. 1-2 Marks Questions
1. Name two basic properties of electric charge.
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2. The electric potential at 0 - 9 m from a point charge is + 50 V. Find the magnitude and nature of the charge.
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3. Small ozone layer on the top of atmosphere is crucial for human survival. Why ?
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4. Sketch lines of force due to point charges (i) q < 0 ; (ii) q > 0.
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5. Define dielectric constant in terms of capacitance of a
Very Short Answer Type Question
Q. 1. What is unit of charge ?
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Q. 2. What are units of potential and current ?
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Q. 3. A heavy current is passed through a wire, is it charged ?
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Q. 4. What is unit of resistance ? Define it.
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Q. 5. What are the factors upon which resistance of a conductor depends ?
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Q. 6. What is specific resistance, resistivity of a wire ? Is it more for thick or thin wire ?
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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 ?
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Q. 8. How is brightness of star represented ?
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Q. 9. What is the value of Solar Constant ?
Answer
Q. 10.