Related Questions

Which of the following gas causes explosion in coal mines?
A Carbon dioxide
B Nitrogen
C Butane
D Methane
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is
A Neutralised by alkali treatment
B Left as such without any treatment
C Diluted with fresh water to reduce its acidity
D None of these
Which of the following treaties was for the purpose of banning nuclear explosions?
A NATO
B CTBT
C NPT
D SALT
Numbing terror filled their brains as they witnessed the explosions. Here the underlined word is closest is meaning to__.
A torpid
B tantalizing
C sentient
D paralyzing
The device attached to the steam chest for preventing explosions due to excessive internal pressure of steam is called
A Safety valve
B Water level indicator
C Pressure gauge
D Fusible plug
Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
A 1000
B 4000
C 6000
D 8000
Coal mines in Jharkhand are located at
A Jharia
B Jamshedpur
C Ranchi
D Lohardaga
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.
The gas that causes suffocation and death when coal or coke is burnt in a closed room is
A Methane
B Ethane
C Carbon monoxide
D Carbon dioxide
The density of a gas 'X' is twice that of another gas 'Y'. If the molecular weight of gas 'Y' is 'M'; then the molecular weight of the gas 'X' will be
A 2M
B $$\frac{{\text{M}}}{2}$$
C M
D $$\frac{{\text{M}}}{4}$$

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