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124λ তরঙ্গদৈর্ঘ্যের এক রঙা এক্সরে একটি কার্বণ ব্লক দ্বারা বিক্ষিপ্ত হয়। 180° তে এক্সবের বিক্ষিপ্ত বিকিরণের তরঙ্গদৈর্ঘ্যের মান নির্ণয় কর।(A monochromatic X-rays of wavelength 0.124λ is scattered by a carbon block. Find the wavelength of X-rays scattered through 180°) 
A 0.0484 λ
B 0.1724 λ
C 0.0756 λ
D 0.0242 λ
E 0.0968 λ
The green light only ever goes on when tank A is full and tank C isn't empty. The red light is always on unless either tank A isn't Full or tank B is empty. Given that the green light is on, we can conclude all of the following EXCEPT---
A Tank A cannot be empty
B The red light must be on
C Tank C cannot be empty
D we don't have enough information to determine whether tank B is empty or not
The surface of a certain planet reflects 80 percent of the light that strikes it. The clouds around the planet then absorb 40 percent of the reflected light. What percent of the light that strikes the planet is reflected from the surface and passes through the clouds without being absorbed?
A 32%
B 40%
C 48%
D 60%
Atoms generate rays of light-
A because they are infrared
B if they are active due to constant motion
C due to constant motion
D when they become warm
Atoms generate rays of light ---?
A they are infrared
B they become warm
C due to constant motion
D they are active
He sleeps a sound sleep, এখানে Sound শব্দটি
A Adjective
B Noun
C Pronoun
D Adverb
Which from the following is true for 'Sound'?Sound cannot pass through ---.
A through gases
B through a vacuum
C through liquids
D through a soks
How much times a sound stay in our brain after listening the sound ?
A 1 sec
B 0.1 sec
C 0.01 sec
D 0.001 sec
They reached home safe and sound. Here 'safe and sound' is a/an:
A adjective phrase
B adverbial phrase
C proverb
D idiom
He sleep a sound sleep. Here 'sound' is a /an
A adverb
B adjective
C noun
D pronoun

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