Assertion:  A charged particle free to move in an electric field always moves along an electric field line. 

Reason: The electric field lines diverge from a negative charge and converge at a positive charge.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion:  If an electron and proton possessing same kinetic energy enter an electric field in a perpendicular direction, the path of the electron is more curved than that of the proton. 

Reason:  Electron forms a larger curve due to its small mass.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false.

• If both assertion and reason are false.

The length of deviation for a glass prism is equal to its refracting angle. The refractive index of glass is 1.5. Then the angle of prism is

• 2 cos^-1(3/4)

• sin^-1(3/4)

• 2 sin^-1(3/2)

• cos^-1(3/2)

44.

Which logic gate is represented by the following, combination of logic gates in figure?

     

• OR

• NAND

• AND

• NOR

If the wavelength of 1line of Balmer series of hydrogen is 6561 A, the wavelength of the 2 line of series will be

• 9780 A^o

• 4860 A^o

• 8857 A^o

• 4429 A^o

n-alpha particles per second are emitted from N atoms of a radioactive element. The half-life of the radioactive element is

• $\frac{\mathrm{n}}{\mathrm{N}} \mathrm{s}$

• $\frac{\mathrm{N}}{\mathrm{n}}\mathrm{s}$

• $\frac{0.693 \mathrm{N}}{\mathrm{n}} \mathrm{s}$

• $\frac{0.693 \mathrm{n}}{\mathrm{N}} \mathrm{s}$

The light of wavelength 4000 A^o falls on a photosensitive substance whose work function is 2 eV. Its stopping potential is

• 1.1 V

• 1.8 V

• 1.26 V

• 0.8 V

Resolving power of reflecting microscope increase with

• decrease in wavelength of incident light

• increase in wavelength of incident light

• increase in diameter of objective lens

• none of these

The near point of distinct vision is at 1 m for an elderly person. What power of lens is to be used to bring the near point to the minimum distance of distinct vision (25 cm)?

• 2.5 D

• 3 D

• 3.5 D

• 4 D

Which of the given statements about transistor is not true?

• Emitter is heavily doped.

• Base is thin.

• Base is lightly doped.

• Collector region is smaller comparative to emitter in size.