List of practice Questions

While measuring acceleration due to gravity by a simple pendulum, a student makes a positive error of $1\%$ in the length of the pendulum and a negative error of $3\%$ in the value of the time period. His percentage error in the measurement of the value of $g$ will be
White light is passed through a prism of angle 5.If the refractive indices of red and blue colours are 1.641 and 1.659 respectively, the angle of dispersion between them is
White P is more reactive than $N_2$ because
Who demonstrated that green plants purify the foul air produced by breathing animals and burning candles?
Who discovered nuclear fission ?
Who gave the lamellar or sandwich model of cell membrane?
Who is regarded as Father of Zoology and Biology?
Who is the father of genetic engineering?
Who proposed a modification in the cell theory?
Who proposed binomial system of nomenclature?
Who proposed the "Cohesion Theory" of ascent of sap?
Who proposed the fluid mosaic model of plasma membrane?
Who provided the evidence that glucose is formed during photosynthesis and is then stored in the form of starch?
Who was the first to introduce the concept of antiparticle theoretically?
Why 220 V ac is more dangerous than 220 V dc
Why all $P - F$ bonds in $PF_5$ are not equivalent ?
Why do noble gases have positive electron gain enthalpy?
Why insulin not administered orally to diabetic patient?
Why is alum added to water containing suspended impurities?
Why is ferric hydroxide colloid positively charged when prepared by adding ferric chloride to hot water?
Why is it necessary to remove sulphur from petroleum products?
Why is partial roasting of sulphide ore done in metallurgy of copper?
Why is the electron gain enthalpy of $O$ or $F$ less than that of $S$ or $Cl$?
Wildlife refers to
Wires A and B are made from the same material. A has twice the diameter and three times the length of B. If the elastic limits are not reached, when each is stretched by the same tension, the ratio of energy stored in A to that in B is