Basic Science T...

A  clerk starts from his house with a speed of $$ 2 kmh^{-1} $$ and reaches the office 3 min late .Next day the increase speed $$ 1 kmh^{-1}$$ and reaches the office 3  min earliar .Find the distance between his house and office .

A vernier callipers (with least count  =  0 .1 mm ) has 20 divisions of the vernier  scale .The main scale division  are of

A body takes $$5$$ min to cool from $$80^\circ C$$ to $$70^\circ C.$$ To cool from $$80^\circ C$$ to $$60^\circ C,$$ it will take (Room temperature = $$40^\circ C$$)

A hypothetical vernier scale of a travelling microscope has 40 divisions which is equal to 38 main scale divisions  if each main scale division is 1.2 mm then minimum error in the measurement of length is 

Glucose contains

M gram of ice at $$0^{\circ} C$$ is mixed with M gram of water at $$10^{\circ} C.$$ The final temperature is

Which of the following instrument is the least precise device for measring length?

Which of the statement are correct ?
(1) An electron $$4p$$ orbital has more energy than one in $$3p$$ orbital 
(2) An electron in $$4s$$ orbital is further from the nucleus than one in a $$3s$$ orbital 
(3) the angular quantum number $$1$$ is related to orbital shape.
(4) Energy is released if electron moves from $$n=2$$ to $$n=5$$ level.

A metal tape gives correct measurement at $$15^{\circ}C$$. It is used to measure a distance of $$100m$$ at $$45^{\circ}C$$. The error in the measurement, if $$\alpha = 12\times 10^{-6}/1^{\circ}C$$ is

Which of the following temperature will read the same value on celsius and Fahrenheit scales.