you are given two nichrome wire of same length and different thickness Which wire will get heated first Give reason.?

You are given two nichrome wire of same length and different thickness Which wire will get heated first Give reason.? Asked Merlin Mary Mathew Answer: If the wires are connected one by one to a source, (or connected in parallel to the same source) the one having less resistance (Greater thickness) will get heated up first. [...]

MODEL QUESTION PAPER FOR AISSCE 2008

PHYSICS

TIME 3 HRS                                    MAX MARKS: 70


GENERAL INSTRUCTIONS:

  1. All questions are compulsory.
  2. There are 30 questions in total. Questions 1 to 8 carry one mark each, questions 9 to 18 carry 2 marks each, questions 19 to 27 carry 3 marks each and questions 28 to 30 carry 5 marks each.
  3. There is no overall choice. However an internal choice has been provided in one question of two marks, one question of 3 marks and all three questions of five marks. You have to attempt ony one of the choices in such cases.
  4. Use of calculators is not permitted.

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      1. What is the polarizing angle of a medium of refractive index √3 ?
      2. Consider the circuit shown, where APB and AQB are semicircles. What will be the magnetic field at the centre ‘C’ of the circular loop?

      3. The closed loop PQRS is moving into uniform magnetic field acting at right angles to the plane of the paper as shown in the figure. State the direction in which the induced current flows in the loop.

      4. What is the angle between the directions of electric field at any point on the equatorial line of an electric dipole and the dipole moment?
      5. Draw the voltage current characteristics of a zener diode.
      6. What is the shortest wavelength present in the Paschen series of spectral lines?
      7. Name the constituent radiation of the electromagnetic spectrum which
        1. Has the wavelength range between 390 nm and 770 nm
        2. Is absorbed from sunlight by ozone layer.
        In an experiment on photoelectric effect the following graphs were obtained between the photoelectric current (I) and the anode potential (V). Name the characteristic of the incident radiation that was kept constant in this experiment.

        Calculate the potential at the centre of a square of side √ 2 m, which carries at its four corners, charges of +2nC, +1nC, -2nC and -3nC respectively. State the condition under which the phenomenon of resonance occurs in a series LCR circuit. Plot a graph showing the variation of current with frequency of the ac source in an LCR circuit. Show that the total energy stored in an inductor L, when a current I is established through it is ½ LI2 . Draw the energy level diagram showing the ground state and next few excited states for H atom. Mark the transition which corresponds to the emission of the spectral series for Balmer series.The graph shows the variation of voltage(V) across the plates of two capacitors A and B versus increase of charge (Q) stored on them, which of the two capacitors have higher capacitance? Give reason for your answer.

        A TV tower has a height of 400m at a given place. Calculate its coverage range if the radius of the earth is 6400 km. Find the wavelength of electromagnetc waves of 5 x 1019 Hz in free space. Give its two applications.How does the resolving power of a compound microscope change on]
        1. Decreasing the wavelength of light used
        2. Decreasing the diameter of its objective lens

          OR

        In a single slit diffraction pattern, read more

Commonly asked questions for AISSE (CLASS X CBSE) Physics (Set – 1)

(Collected from Previous Board Question Papers and CBSE Sample Papers andGuess Papers made by experienced teachers)

Where does centre of curvature of a spherical mirror lie? Name two important properties of a magnet. How is 1 ohm related to ampere and volt? Draw neat ray diagrams to illustrate the formation of images due to a beam of light incident parallel to the principal axis of a (i) concave mirror, (ii) convex mirror in each case. Why is a series arrangement not used for connecting domestic electrical appliances in a circuit? Out of 60 W and 40 W lamps, which one has a higher electrical resistance when in use? Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed.(a) at F (b) Between F and O What is meant by the term, ‘magnetic field’? Why does a compass needle show deflection when brought near a bar magnet? Two lamps, one rated 60W at 220 V and the other 40W at 220 V, are connected in parallel to the electric supply at 220V.(a) Draw a circuit diagram to show the connections.

(b)Calculate the current drawn from the electric supply.

(c)Calculate the total energy read more