Options:
- A. watt
- B. horse power
- C. kilo watt
- D. kilowatt hour
View Answer
D. kilowatt hour
Physics
Wavelength of X-rays falling at glancing angle of 30? on a crystal with atmic spacing 2 x 10-10 for the fist order diffraction is________________?
Options:
- A. 4 x 10-10 m
- B. 2 x 10-10 m
- C. 0.02
- D. 20
View Answer
B. 2 x 10-10 m
A light ray traveling form rarer to denser medium suffers a phase change of__________________?
Options:
- A. 60
- B. 90
- C. 180
- D. 45
View Answer
C. 180
If velocity is doubled then__________________?
Options:
- A. momentum increases 4 times and K.E increases 2 times
- B. momentum and K.E. remain same
- C. momentum increases 2 times and K.E increases constant
- D. momentum increases 2 times and K.E increases 4 time
View Answer
D. momentum increases 2 times and K.E increases 4 time
The physics of moving charge particles is known as__________?
Options:
- A. Plasma physics
- B. Electro-static
- C. Electro-magnetic
- D. Electro-dynamics
View Answer
D. Electro-dynamics
Which of the following pair has same direction always ?
Options:
- A. force, displacement
- B. force, velocity
- C. force, acceleration
- D. force, momentum
View Answer
C. force, acceleration
Newtons laws do not hold good for particles_______________?
Options:
- A. at rest
- B. moving slowly
- C. move with high velocity
- D. move with velocity comparable to velocity of light
View Answer
D. move with velocity comparable to velocity of light
The distance between any two consecutive crests or troughs is called____________________?
Options:
- A. frequency
- B. period
- C. Wave length
- D. phase difference
View Answer
C. Wave length
When two identical traveling waves are superimposed, the velocity of the resultant wave__________________?
Options:
- A. decreases
- B. increases
- C. remains unchanged
- D. becomes zero
View Answer
C. remains unchanged
Fundamental frequency of stationary waves in open pipe is ______________ times the frequency in closed pipe?
Options:
- A. One
- B. Two
- C. Four time
- D. None of these
View Answer
B. Two