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)
A.
2 cos-1(3/4)
δm = A
μ = 1·5
=
cos
⇒
⇒ A = 2
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 Ao
4860 Ao
8857 Ao
4429 Ao
n-alpha particles per second are emitted from N atoms of a radioactive element. The half-life of the radioactive element is
The light of wavelength 4000 Ao 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.