A 'body' which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the

The incoming short-wave solar radiation is balanced by an equal amount of long-wave radiation from earth going back to space. This is known as ________

A

Earth radiation

B

Wave balance of earth

C

Heat balance of earth

D

Radiation exchange

Which of the following provides a storage mechanism for incoming mail but does not allow a user to download messages selectively?

A

SMTP

B

DHCP

C

IMAP

D

POP3

E

2

When red is X, green is Y, when green is not Y blue is Z. But the is never Z as long as red is red is X. which of the following statements is trued in this context?

A

while blue is Z, green is Y

B

While red is not X, blue is not Z

C

while green in not y, red is not X

D

None of the above

When red is X, green is Y, When green is not Y, blue is Z, but the is never Z as long as red is red is X. Which of the following statements is true in this context?

A

While blue is z, green Y

B

While red not X, blue is not Z

C

While green is not Y, red is not X

D

None of the above

The change in length due to a tensile or compressive force acting on a body is given by (where P = Tensile or compressive force acting on the body, $$l$$ = Original length of the body, A = Cross-sectional area of the body and E = Young's modulus for the material of the body)

A

$$\frac{{{\text{P}}l{\text{A}}}}{{\text{E}}}$$

B

$$\frac{{{\text{P}}l}}{{{\text{AE}}}}$$

C

$$\frac{{\text{E}}}{{{\text{P}}l{\text{A}}}}$$

D

$$\frac{{{\text{AE}}}}{{{\text{P}}l}}$$

If white is called black, black is called red, red is called yellow, yellow is called green, green is called blue, blue is called violet and violet is called orange, what would be the colour of human blood?

A

green

B

black

C

red

D

yellow

There are 87 balls in a jar. Each ball is painted with at least one of two colors, red or green. It is observed that 2/7 of the balls that have red color also have green color, while 3/7 of the balls that have green color also have red color. what fraction of the balls in the jar has both red and green colors?

A

6/14

B

2/7

C

6/35

D

6/29

তড়িৎ রাসায়নিক কোষের emf = ?i.E0Anodee(ox)+E0cathode(Red)ii.E0cathode(Red)-E0Anodee(Red)iii.E0Anodee(ox)-E0cathode(Red)কোনটি সঠিক?

A

i ও ii

B

i ও iii

C

ii ও iii

D

i, ii ও iii

তড়িৎ রাসায়নিক কোষের emf = ?i. E° Anode(ox) + E°Cathode (Red) 11. E Cathode(Red) - E°Anode (Red) 111. E° Anode(ox) - E°Cathode (Red) নিচের কোনটি সঠিক?

A

i ও ii

B

i ও iii

C

ii ও iii

D

i, ii ও iii

একটি ধাতব তলে λ তরঙ্গদৈর্ঘ্যের একবর্ণী আলোকরশ্মি আপতিত হলে ফটো-ইলেক্ট্রন নির্গত হয় এবং এক্ষেত্রে বিভবের মান 3Vo একই তলে যখন 2λতরঙ্গদৈর্ঘ্যের একবর্ণী আলো আপতিত হয়, তখন নিবৃত্তি বিভবের মান Vol ফটো-ইলেক্ট্রন নির্গত হওয়ার জন্য ঐ তলটির সূচন তরঙ্গদৈর্ঘ্যের মান নির্ণয় কর।(A monochromatic light of wavelength λ is incident on a metallic surface then ejects photo-electron and the value of stopping potential is 3Vo. When the same surface is illuminated by a light of wavelength 2λ., the stopping potential becomes Vo. Calculate the threshold wavelength for this surface to eject photo electrons.)

A

6λ

B

8λ

C

4λ3

D

λ

E

4λ

A 'body' which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the

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