Related Questions

As an atom absorbs energy, ........ increases and the atom is said to be excited.
A as its energy level
B it is energy level
C the energy level of it
D the energy level
As an atom absorbs energy , ................. increases, and the atom is said to be excited .
A its energy level
B as its energy level
C it is energy level
D the energy level of its
A survey was conducted among the students of Khulna University to find out how many forms of physical exercise usually swam, 25% said they usually did jogging, 20% said they played cricket, 15% said they usually played football and 20 respondents said they did not take any form of exercise. From the above findings it can be concluded that.
A The student of khulna University do not usually take physical exercise.
B No respondent took more than one form of exercise.
C The method of data collection was not valid.
D Some of the respondents took more than one form of exercise.
An object which absorbs all colours and reflects none appears:
A White
B Grey
C Blue
D Black
Which of the following absorbs the insolation from the sun and preserves the earth's radiated heat, thus acting like a blanket allowing the earth neither to become too cold nor too hot?
A Dust
B Water vapour
C Ozone
D Nitrogen
একটি কার্নো ইঞ্জিন 237°C এবং 139°C তাপমাত্রায় কার্যরত। উচ্চ তাপমাত্রায় এটি যদি 2.54 x 106 J তাপ শোষন করে, প্রতি সাইকেলে ইঞ্জিনটি কি পরিমান কাজ করছে ? (A Carnot engine operates between 237°C and 139°C. If it absorbs 2.54 x 106 J heat at high temperature, how much work is done by the engine per cycle?)
A  50.4 x 104 J  
B 450 kJ  
C 4.8 x 104 J  
D 488 kJ 
E  6.04 x 105 J
Blotting paper absorbs ink due to
A Capillary action phenomenon
B Diffusion of ink through the blotting
C Siphon action
D Viscosity of ink
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.
A Hydrogen
B Carbon dioxide
C Ozone
D None of these
Ozone layer of atmosphere absorbs:
A Ultraviolet rays
B Infra-red rays
C All radiations of Light
D Cosmic rays.
Which of the following absorbs maximum heat in a high pressure boiler ?
A Economiser
B Steam superheater
C Air preheater
D Furnace water wall

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