Electro-magnetic spectrum range, which is important for radiation varies from __________ microns.

The range of electromagnetic spectrum important in heat transfer by radiation is __________ microns.

A

0.38-0.78

B

0.5-50

C

100-1000

D

5-50

The entire range of the electromagnetic spectrum spans a large spectrum of wave lengths varying from:

A

10^-10 to 10⁶ m

B

10^-8 to 10⁶ m

C

10^-10 to 10¹⁰ m

D

10^-8 to 10⁸ m

Particle size range in which dust catcher (gravity settling chamber) works most effectively and efficiently is __________ microns.

A

[

A.

B. 10 to 25

B

> 1000

Brownian movement is prominent in the particle size range of __________ microns in case of settling of a particle in a fluid.

A

2 to 3

B

0.01 to 0.10

C

200 to 300

D

100 to 1000

Alphatron measures pressure __________ microns.

A

[

A.

B.

B

> 3

In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lie ?

A

Visible

B

Infrared

C

Ultraviolet

D

X-ray

তড়িৎচুম্বকীয় বর্ণালিতে (electromagnetic spectrum) নিচের কোনটির তরঙ্গদৈর্ঘ্য সবচেয়ে বেশি?

A

UV-ray

B

X-ray

C

TV-waves

D

Infrared ray

Electromagnetic spectrum contains:

A

Gamma rays (wave length -10 m)

B

Ultraviolet rays (wave length -6 m)

C

Infrared rays (wave length -4 m)

D

All of these

How many microns are there in a metre?

A

1000

B

10000

C

1000000

D

100000

If A varies directly proportional to C and B also varies directly proportional to C, which one of the following is not correct ?

A

$$\left( {A + B} \right)\alpha \,C$$

B

$$\left( {A - B} \right)\alpha \,\frac{1}{C}$$

C

$$\sqrt {AB} \,\alpha \,C$$

D

$$\frac{A}{B} = {\text{constant}}$$

Electro-magnetic spectrum range, which is important for radiation varies from __________ microns.

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