MIN ( ) function returns ?
A. Highest value
B. Lowest value
C. Negative value
D. Positive value
1 Answers
(A) the total energy of an electron revolving in any stationary orbit is negative. (R) energy can have positive or negative values.
Correct Answer - B Energy can have positive or negative values. in the atom. the electrons are bound . The negative energy of the revolving electrons does not allow the electrons...
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What are (a) the lowest frequency (b) the scond lowest frequency and (c) the third lowest frequency for standing waves on a wire that is `10.0 m` long
Correct Answer - (a) `2.5 Hz;` , (b) `5 Hz` , (c) `7.5 Hz`. `v = sqrt((T)/(mu)) = sqrt((25)/((100 xx 10^(3))/(10))) = 50` `:. V_(0) = (v)/(2L) = (50)/(2 xx 10)...
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The rate constant of a first order reaction at `27^(@)C "is" 10^(-3)"min"^(-1)`.The constant ( in `"min"^(-1)`) at `17^(@)C` for this reaction ?
Correct Answer - B `(k_(T_(2)))/(k_(T_(1)))=(mu)^(DeltaT//10)` `(10^(-3))/(k_(T_(1)))=(mu)^(10//10)=2` `k_(T_(1))=(10^(-3))/(2)=0.5xx10^(-3)=5xx10^(-4)"min"^(-1)`
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`T_(50)` of first order reaction is 10 min. starting with 10 `"mol"^(-1)` rate after 20 min is :
Correct Answer - B Remainin concetration of reactant after 20 min `=(1)/(4)xx102.5"mol"L^(-1)` `"Rate"=kxx["Reactant"]=(0.693)/(t_(1//2))xx["Reactant"]` `=(0.693)/(10xx2.5=0.0693xx2.5 "mol"L^(-1) min^(-1)`
2 Answers 1 views
A river is flowing from east to west at a speed of `5m//min`. A man on south bank of river, capable of swimming `10m//min` in still water, wants to sw
Correct Answer - A For shortest time he has to cross the river with swimming perpendicualr to flow i.e. due north
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The rate of effusion of a particular gas whas measured to be 40ml/min. Under same condition the rate of effusion of pure methane was 20ml/min. Then fi
`(r_(CH_(4)))/(r_(gas))=sqrt((M_(gas))/(16))=(20)/(40)=(1)/(2)` `M_(gas)=4gm`
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Lacto bacillus has generation time 60 min. at 300 K and 40 min. at 400 K. Determine activation energy in `(kJ)/(mol)` . (`R = 8.3 J K^ (–1) mol^(–1)`
Correct Answer - 3.98
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MAX ( ) function returns ? A. Highest value B. Lowest value C. Negative value D. Positive value
Correct option is: A. Highest value
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A river is flowing from the west to the east at 5m/min. A swimmer on the southerm bank can swim at 10 m/min in still water. In what direction should h
Correct Answer - (i) south to north (ii) `30^(@)` west of north
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___________ returns ‘true’ if given value is not a number. It returns ‘false’ if given value is number.
1. isNaN() 2. Function
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