In Young’s double slit experiment, the ratio of maximum and minimum intensities in the fringe system is 9:1. The ratio of amplitudes of coherent sources is
Options
(a) (9:1) (b) (3:1) (c) (2:1) […]
A plane wave of wavelength 6250Å is incident normally on a slit of width 2×10⁻² cm. The width of the principal maximum of diffraction pattern on a screen at a distance of 50cm will be […]
During an adiabatic process, the cube of the pressure is found to be inversely proportional to the fourth power of the volume. Then the ratio of specific heats is
Options
(a) 1 (b) […]
A carnot engine working between 300 K and 600 K has a work output of 800J per cycle. The amount of heat energy supplied to the engine from the source in each cycle is
The sun light reaches us as white and not as its components because
Options
(a) air medium is dispersive (b) air medium is non-dispersive (c) air medium scatter the sunlight (d) air medium […]
Aperture of human eye is 0.2 cm. The minimum magnifying power of a visual telescope, whose objective has diameter 100 cm is
Options
(a) 500 (b) 0.002 (c) 0.02 (d) 100
Correct Answer: […]
If critical angle for a material to air passage is 30°, the refractive index of the material will be
Options
(a) 1 (b) 1.5 (c) 2 (d) 2.5
Correct Answer:
2
Explanation:
No […]
A radioactive substance decays to 1/16th of its initial activity in 40 days. The half-life of the radioactive substance expressed in days is
Options
(a) 2.5 (b) 5 (c) 10 (d) 20
Correct Answer: […]
If a nucleus ᴢXᴬ emits 9α and 5β-particles, then the ratio of total protons and neutrons in the final nucleus is
Options
(a) (Z-13)/(A-36) (b) (Z-13)/(A-Z-13) (c) (Z-18)/(A-36) (d) (Z-13)/(A-Z-23)
Correct Answer:
(Z-13)/(A-Z-23)
The respective speeds of the molecules are 1,2,3,4 and 5 km/s. The ratio of their r.m.s. velocity and the average velocity will be
Options
(a) √11:3 (b) 3:√11 (c) (1:2) (d) (3:4)
Correct […]
2017-2025 Copyright Doctor Dreams Training Academy - About Us - Privacy Policy - Terms & Conditions - Contact Us - Refund Policy