Sample paper 3

1.  What are wind energy farms?

2.  What is meant by potential difference between two points?

3.  How much energy will an electric bulb draw from a 220 V source, if the resistance of the bulb-filament is 1200 ohms?

4. What is electromagnetic induction?

5. In what way can the magnitude of induced current be increased?

6. Calculate the electrical energy consumed by a 1200 W toaster in 20 minutes.

7. Biomass has been used as fuel since ancient times, how has it been modified to function as a more efficient fuel in the recent past.

8. Two identical resistors, each of resistance 20 ohms are connected (i) in parallel (ii) in series, in turn, to a battery of 10V. Calculate the ratio of power consumed in the combination of resistors in the two cases.

9. Two resistors of resistances 3 ohms and 6 ohms respectively are connected to a battery of 6 V so as to have
(a)    Minimum resistance,    (b) minimum current
(i)  How will you connect the resistances in each case?
(ii) Calculate the strength of the current in the circuit in both cases.

10. Explain what is short circuiting and overloading in an electric supply?

11. Why can’t two magnetic field lines cross each other?

12. Draw the magnetic field lines (including field directions) of the magnetic field due to a long straight solenoid. What important property of this field is indicated by this field line pattern? Name any two factors on which the magnitude of the magnetic field due to this solenoid depends.

13. State the rule to determine the direction of a
(i)  Magnetic field produced around a straight conductor carrying current.
(ii) Force experienced by current – carrying straight conductor placed in a magnetic field which is perpendicular to it.
(iii) Current induced in a coil due to its rotation in a magnetic field.

14. Differentiate between AC and DC. Write one advantage of AC over DC.

Physics sample Paper 2

        1.  The voltage – current (V – I) graph of a metallic conductor at two different temperature T1 and T2 is shown below. At which temperature is the resistance higher?

 

2. In the circuit diagram shown, the two resistance wires A and B are if same area of cross section and same material, but A is longer than B. Which ammeter A1 or A2 will indicate higher for current? Give reason.

 3. A student while studying the force experienced by a current carrying conductor in a magnetic field records the following observations.
(i)       The force experienced by the conductor increases as the current is increased.
(ii)      The force experienced by the conductor decreases as the strength of the magnetic field is increased.
Which of the two observation is correct and why?

4.  How would the reading of voltmeter (V) change if it is connected between B and C? Justify your answer.

  

5.  What would be the reading of ammeter and voltmeter in the given circuit?

6.  Two conducting wires of same material, equal length and equal diameter are first connected in series and then in parallel. Compare the equivalent resistance in two cases.

7.  What change in the deflection of the compass needle placed at a point near current carrying straight conductor shall be observed if the –
(a)    Current through the conductor is increased?
(b)    Direction of current in the conductor is reversed?
(c)    Compass is moved away from the conductor?

8.  What are magnetic field lines? List any two characteristics of field lines. Draw the pattern of magnetic field of lines due to a current carrying circular loop.

9.  Draw the schematic diagram showing common domestic circuit.

10. State the function of an earth wire? Why is it necessary to earth metallic appliances such as an electric iron?

Physics sample paper 1

SAMPLE QUESTION PAPER 1

1. You have two metallic wires of resistances 6 ohms and 3 ohms. How will you connect these wires to get the effective resistance of 2 ohms? 

2. Calculate the electrical energy consumed by a 1200 W toaster in 20 minutes.

3. State Ohm's Law. Write a mathematical expression for it.

4. No two magnetic field lines interest each other. Explain.

5. What precautions should be taken to avoid the overloading of domestic electric circuits?

6. An electric oven of 2KW power rating is operated in a domestic electric circuit (220V), that has a current rating 5 A. What result do you expect? Explain.

7. A piece of wire of resistance 20 ohms is drawn out so that its length is increased to twice its original length. Calculate the resistance of the wire in the new situation.

8. Study the following circuit and answer the following questions.

   (i) State the type of combination of the two resistors in the circuit.
   (ii) How much current is flowing through
      (a) 10 ohms and through
      (b) 15 ohms resistors
   (iii) What is ammeter reading?

9. A positively charged particle projected towards west is deflected towards north by a magnetic field. What is the direction of the magnetic field?

10. Draw the magnetic field lines of the field produced due to a current carrying circular loop.

11. State the law used to find the direction of magnetic field around a straight current carrying conductor.

12. (a) What is a solenoid?
      (b) Draw the field lines of the magnetic field through and around a current carrying solenoid.
      (c) Which rule helps to find the force on a current carrying conductor in a magnetic field? State the rule.