CBSE Physics Sample Question Paper : Set I
Q. 1. What is the role of MnO2 in a dry cell ?
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Q. 2. Define one lumen.
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Q. 3. A wire of resistivity p is stretched to four times its length. What will he its new resistivity ?
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Q. 4. An electron, moving with a velocity of 10 ms enters a uniform magnetic field of IT, along a direction parallel to the field. What would be its trajectory in this field ? 1
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Q. 5. How does the resolving power of a telescope change when the aperture of its objective is increased ?
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Q. 6. Suppose there existed a planet that went around the sun twice as fast as the earth, Will its orbital radius be more than or less than that of the earth ?
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Q. 7. An electric lamp connected in series with a capacitor and an A.C. source is glowing with certain brightness. How does the brightness change on reducing the capacitance ?
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Q. 8. An equiconvex lens of focal length 15 cm is cut into two halves as shown. What is the focal length of each half ?
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Q. 9. What is meant by ‘red shift’ ? What does it tell us about the universe ? 2
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Q. 10. What is the name given to the curves, the tangent to which at any point gives the direction of magnetic field at that point ? Can two such curves intersect each other 7 Justify your answer.
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Q. 11. Write two points of difference between interference and diffraction patterns of light. 2
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Q. 12. Calculate the refractive index of the material of an equivalent prism for which the angle of minimum deviation is 60°.
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Q. 13. If a compass box and a dip circle were to be taken to magnetic north pole of the earth, what would one observe with regard to deflections of the respective needles and why ? 2
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Q. 14. A circular brass loop of radius a and resistance R is placed with its plane perpendicular to magnetic field which varies with time as B = B0 sin cot. Obtain an expression for the induced current in the loop.
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Q. 15. How would the following be affected in the absence of atmosphere around the earth ?
(a) Surface temperature of the earth.
(b) Range of radio waves transmission.
Give brief reason for your answer in each case.
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