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General Knowledge :: Physics

  1. Which of the following represents a relation for ''heat lost = heat gained'?

  2. A.

     Principle of thermal equilibrium

    B.

     Principle of colors

    C.

     Principle of calorimetry

    D.

     Principle of vaporization

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  3. Q = mcdT refers to

  4. A.

     Enthalpy formula

    B.

     Heat Transfer formula

    C.

     Specific Heat formula

    D.

     Heat of Vaporization

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  5. Steam at 100°C causes more severe burns than water at 100°C because

  6. A.

     Steam has no specific heat capacity

    B.

     Steam has latent heat of vaporisation

    C.

     Water has no specific heat capacity

    D.

     Water has latent heat of fusion

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  7. No current will flow between two charged bodies if they have the same

  8. A.

     Resistance

    B.

     Charge

    C.

     Potential

    D.

     Charge/ potential ratio

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  9. Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes

  10. A.

     2R

    B.

     R/2

    C.

     5R/4

    D.

     3R/4

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  11. Find the resistance (in mega) of a wire of length 20m, cross sectional area 1 cm2 and made of a material of resistivity 200m.

  12. A.

     40

    B.

     4000

    C.

     80

    D.

     2000

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  13. A copper wire of radius r and length l has a resistance of R. A second copper wire with radius 2r and length l is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be

  14. A.

     5 R

    B.

     5 R/4

    C.

     4 R/5

    D.

     R/5

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  15. Which of the following is a good conductor of heat but a bad conductor of electricity ?

  16. A.

     Celluloid

    B.

     Rubber

    C.

     Asbestos

    D.

     Mica

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  17. When a number of resistors are connected in series in a circuit, the value of current:

  18. A.

     Increases

    B.

     Becomes half

    C.

     Decreases

    D.

     Remains the same

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  19. A good conductor while carrying current is

  20. A.

     Alternately charged positive and negative

    B.

     Negatively charged

    C.

     Positively charged

    D.

     Electrically neutral

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