Moving Charges and Magnetism — Physics STD 12 Science — Question

In an LCR series a.c. circuit, the voltage across each of the components. L, C and R is 50V. The voltage across the LC combination will be:

In  solution when electric current equal to 2.5 faraday is passed, the gm equivalent deposited on the cathode is

(a) 1

(b) 1.5

(c) 2

(d) 2.5

The magnetic field due to a straight conductor of uniform cross section of radius a and carrying a steady current is represented by

(a)

(b)

(c)

(d)

A Young's double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is

(a) Straight line

(b) Parabola

(c) Hyperbola

(d) Circle

When we wear nylon dresses during winter then there is ______ current which gets produced due to contact with out body. Fill in the Blank.

Assertion :   The threshold frequency of photoelectric effect supports the particle nature of sunlight.

Reason      : If frequency of incident light is less than the threshold frequency, electrons are not emitted from metal surface.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

Magnifying power of a simple microscope is (when final image is formed at D = 25 cm from eye)

(a)

(b) 1 +

(c)

(d)

In Cu-Fe couple, the flow of current at the temperature of inversion is

(a) From Fe to Cu through the hot junction

(b) From Cu to Fe through the hot junction

(c) Maximum

(d) None of the above

Which state of triply ionised Baryllium (  has the same orbital radius as that of the ground state of hydrogen

(a) n = 4

(b) n = 3

(c) n = 2

(d) n = 1

This symbol represents

(a) NOT gate

(b) OR gate

(c) AND gate

(d) NOR gate