Paper no.6 physics

Created on By buzzerkings


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30. A torch is rated 2.2 V. 0.25 A. Calculate the charge passing through the bulb in one second and energy transferred by the passage of each coulomb of charge

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29. Find the radius of an orbit of an electron moving at a rate of 2.0 x 10^7 m/s in a uniform magnetic field of 1.20 × 10^-3 T.

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28. What shunt resistance must be connected across a galvanometer of 50.00 resistance which gives full scale deflection with 2.0 mA current, so as to convert it into an ammeter of range 10.0 A?

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27. A platinum wire has resistance of 10 at 0°C and 20 at 273°C. What is the value of temperature coefficient of resistance of platinum? 

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26. The potential difference between the terminals of a battery in open circuit is 2.2V. When it is connected across a resistance of 5.02, the potential falls to 1.8V. What is the current of the battery?

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25.  A digital system deals with quantities or variables which have only two discrete values or states. Identify the example/s of such quantities.

(|) A switch can be either open closed.

(II) A bulb can be either off or on.

(III) A certain statement canbe either true of false.

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24.  If a process cannot be retraced in the backward direction by reversing the controlling factors. It is a/an:

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22.  The turbine in a steam power takes steam from a boiler at 427°C and exhaust into a low temperature reservoir at 77°C. What is the maximum possible efficiency?

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22. Identify the postulate / s which help to formulate a mathematical model of gases.

 (|) A finite volume of gas consists of very large number of molecules.

 (II) The size of the molecules is much smaller than the separation between molecules.

(III) Molecules do not exert force on each other except during a collision.

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21. A steel wire 12 mm is diameter is fastened to a long and then pulled by tractor. The length of steel wire between the log and the tractor is 11m. A force of 10,000 N is required to pull the log. What is the stress in the wire?

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10. Identify the main type (s) of nuclear reactors:

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9. A reaction in which a heavy nucleus like that of uranium splits up into two nuclei of roughly equal size along with the emission of energy during the reaction is called as:

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8. Fluorescence is the property of absorbing radiant energy of____frequency and re-emitting energy of____ frequency in the visible region of electromagnetic spectrum.

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7.  The half-life T1/2  of a radioactive elements is that period in which____ of the atoms decay.


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6.  A nucleus consists of nucleons comparising of protons and neutrons. A proton has  a positive charge equal to ……………………...... and has a mass______

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5. What is the energy of a photon in a beam of infrared radiation of wavelength 1240 nm?

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4. The special theory of relativity is based upon:

(|) The laws of physics are the same in all inertial frames.

(II) The speed of light in free space has the same value for all observers regardless of their state of motion.

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3. The emission of electrons from a metal surface when exposed to light of suitable

frequency is known as:

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2. What is the mass "m" of a moving object with speed 0.8 c.

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1. The time period of a pendulum is measured to be 3.0 seconds in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum?

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20. At points where the displacements of two waves cancel each other's effect, the path difference is an odd integral multiple of half the wavelength. This effect is known as:

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19.  A pipe has a length of 1m. Determine the frequencies of the fundamental and first two harmonic if the pipe is opened at both ends. (speed of sound in air = 340 m/s)

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18. Those waves in which the particles of medium have displacement along the direction of propagation of waves are known as:

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17. The ratio of the angles subtended by the image as seen through the optical device to that subtended by the object at the unaided eye is known as:

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16. The distance between the slits in Young's double slit experiment is 0.25cm. Interference fringes are formed on a screen placed at a distance of 100cm from the slits. The distance of the third dark fringe from the central bright fringe is 0.059cm. What is the wavelength of the incident light?

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15. The property of bending of light around obstacles and spreading of light waves into geometrical shadow of an obstacle is known as:

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14. An object moving through a fluid experiences a retarding force known as drag force. The drag force the speed of the object…….

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13. A 1500 kg vehicle has its velocity reduced from 20 m/s to 15 m/s in 3.0 seconds. How large was the average retarding force?

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12. Numbers are expressed in standard form called scientific notation, which employs powers of:

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11. What is the average translational kinetic energy of molecules in a gas at

temperature 27°C?

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