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1541. Given : Humidity - H High - A, Wind velocity - W, Low - B, Temperature - TThe desert cooler is an appropriate cooling device for regions where
A. H-A, W-A, T-A
B. H-B, W-A, T-A
C. H-A, W-A, T- B
D. H-A, W-B, T-A
Explanation:
1542. Which one of the following properties of glass is used in green house to trap heat on a sunny day ?
A. It is transparent to short wave radiation but obstruct the long wave infrared radiation
B. It is transparent to long infrared radiation emitted by very hot objects
C. It obstructs the shorts wave infrared radiation, emitted by very hot objects
D. None of the above
Explanation:
1543. Rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena are responsible for this ? 1. Diffusion 2. Refraction3. Internal reflection
A. 1, 2 and 3
B. 1 and 2
C. 2 and 3
D. 1 and 3
Explanation:
1544. What is the function of a microprocessor in a computer ?
A. It allows the key board to write on the computer
B. It allows the outputs to be taken from a computer
C. It performs all the functions of a CPU
D. None of these
Explanation:
1545. A person is moving towards a plane mirror with a speed of 1 m/sec. The image with approach the moving person with a relative speed of :
A. 1/2 m/sec
B. 1 m/sec
C. 2 m/sec
D. 3 m/sec
Explanation:
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