CBSE PMT Pre Medical Test

1. What is the limit of frequency up to which signals using a sky wave can be transmitted? Answer 2. Draw the graph showing the variation of See beck coefficient with temperature of the hot junction. Answer 3. What is the power factor of an ...

Q. 1. Sketch two equipotential surfaces for a point charge. Answer Q. 2. If the length of a wire conductor is doubled by stretching it, keeping the p.d. across it constant, by what factor does the drift speed of electrons change? Answer Q. 3. Give two factors on which the temperature of ...

Q. 1. Give the ratio of velocities of light rays of wavelengths 4000 A and 8000 A in vacuum. Answer Q. 2. A student obtains resistances of 3, 4, 12 and 16 ohms using only two metallic resistance wires either separately or joined together. What is the value of resistance of each ...

Q. 1. In a medium the force of attraction between two point electric charges, distance’d’ apart, is F. What distance apart should these be kept in the same medium so that the force between them becomes 3F? Answer Q. 2. Name the experiment which established the quantum nature of electric ...

Q. 1. Horizontal component of Earth's magnetic field at a place is √3 times the vertical component. What is the value of angle of dip at this place? Answer Q. 2. Force between two point electric charges kept at a distance d apart in air is F. If these charges are kept ...

Q. 1. Sketch the electric lines of force for two positive charges Q1 and Q2 (Q1 > Q2) separated by a distance d. Answer Q. 2. Why is a voltmeter always connected in parallel with a circuit element across which voltage is to be measured? Answer Q. 3. What is ...

1. How does the luminosity of a star vary with its mass? Answer 2. State two factors by which the range of transmission of signals by a T.V. tower can be increased. Answer 3. The ratio of the horizontal component to the resultant magnetic field of earth at a given place is 1/√2. What ...

Q. 1. Name the physical quantity whose SI unit is Coulomb/Volt. Answer Q. 2. Write the frequency limit of visible range of electromagnetic spectrum in kHz. Answer Q. 3. How does the conductance of a semi-conducting material change with rise in temperature? Answer Q. 4. The force ...

Q. 1. Name the physical quantity whose SI unit is Coulomb/Volt. Answer Q. 2. Write the frequency limit of visible range of electromagnetic spectrum in kHz. Answer Q. 3. How does the conductance of a semi-conducting material change with rise in temperature? Answer Q. 4. The force ...

Q. 1. An electron and a proton are free to move in a given electric field. Will the acceleration experienced by them be equal or different? Answer Q. 2. Is the potential difference across the two p.n. junctions in the given circuit same or different? Answer Q. 3. ...