Physics Mcqs

Ratio of the weight of H-atom to that of an electron is approximately______________?

• (A)  18.336
• (B)  1836
• (C)  18360
• (D)  183.6

Answer

Submitted By :Ali Uppal

Michelson calculated the speed of light using the instruments______________?

• (A)  spectrometer
• (B)  galvanometer
• (C)  interferometer
• (D)  none of these

Answer

Submitted By :Ali Uppal

The equation θ = 1.22 λ/D was devised by_______________?

• (A)  Newton
• (B)  Einstein
• (C)  Raleigh
• (D)  Planks

Answer

Submitted By :Ali Uppal

A convex lens acts as a diverging lens if the_________________?

• (A)  object is beyond C
• (B)  if the object is with in C
• (C)  if the object is within f
• (D)  both B and C

Answer

Submitted By :Ali Uppal

Michelson devised the formula to calculate the speed of light_______________?

• (A)  C = 4fd
• (B)  C = 8fd
• (C)  C = 16fd
• (D)  C = 5/2fd

Answer

Submitted By :Ali Uppal

In optic fiber transmission the repeater are separated through a distance of __________ km in newer system?

• (A)  300km
• (B)  200km
• (C)  100km
• (D)  20km

Answer

Submitted By :Ali Uppal

The penetrating power of X-rays depends on their______________?

• (A)  applied voltage
• (B)  frequency
• (C)  source
• (D)  all of the above

Answer

Submitted By :Ali Uppal

Bracket series is obtained when all transition of electron terminate on_______________?

• (A)  4th orbit
• (B)  5th orbit
• (C)  3rd orbit
• (D)  2nd orbit

Answer

Submitted By :Ali Uppal

The electric P.E of an electron in an orbit at a distance rn from the positive charge_____________?

• (A)  Ke2/rn
• (B)  Ke2/rn2
• (C)  ÀKe2/rn
• (D)  ÀKe2/rn2

Answer

Submitted By :Ali Uppal

Ground state energy of the 4th orbit in a H-atom is_____________?

• (A)  13.60 eV
• (B)  3.40 eV
• (C)  0.85 eV
• (D)  1.51 eV

Answer

Submitted By :Ali Uppal