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Which of the following statements about Regular Expression is/are incorrect? A. The union of two regular expressions is also a regular expression B. The concatenation of two regular expressions is also a regular expression C. The iteration of a regular expression is also a regular expression
Which of the following is the correct sequence in the development of geographic thought? (A) Greeks, Roman, Arabs, Dark Ages (B) Greeks, Roman, Dark Ages, Arabs (C) Roman, Greeks, Arabs, Dark Ages (D) Arabs, Greeks, Roman, Dark Ages  (E) Greeks, Dark ages, Roman, Arabs Choose the correct answer from the options given below:
The use of energy from sunlight by plants doing photosynthesis is the basis of life on earth. Which of the following statement is correct for photosynthesis? 1. chlorophyll (green pigment of the leaf), light, and CO2 are required for photosynthesis to occur. 2. photosynthesis occurs only in the green parts of the leaves in the presence of light.  3. chlorophyll is the chief pigment associated with photosynthesis.
Consider the following statements.
1. Carbon dioxide, chlorophyll and sunlight all are essential for photosynthesis.
2. Rate of photosynthesis is maximum in red light and minimum in green light.
3. Increase in O2 concentration decrease photosynthesis.
Which of the statements given above is/are correct about photosynthesis ?
In the following question below some statements are given followed by some conclusions. Taking the given statements to be true even if they seem to be at variance from commonly known facts, read all the conclusions and then decide which of the given conclusions logically follows the given statements. Statements: Some led are light No light is dark All dark is black Conclusion: I. Some black are led is a possibility. II. some led are dark.
At Lions High school 100 students are taking chemistry and 80 students are taking Biology. If 20 students are taking both chemistry and Biology , what is the ratio of the students taking only chemistry to the number taking only Biology?
Select the correct answer choice of the following Question : "At Lions High School 100 students are taking Chemistry and 80 students are taking Biology. If 20 students are taking both Chemistry and Biology, what is the ratio of the students taking only Chemistry to the number taking only Biology?
For the reaction, A = X + Y, the respective concentrations are CA, CX and CY. The forward reaction rate constant is kf and the backward reaction rate constant is kb. Choose the correct statement from the following:
P. At equilibrium, kf CA > kB CxCy
Q. If the reaction is irreversible than, kb CXCY = 0
R. The backward reaction rate will essentially be first order, if the forward reaction rate is first order.
S. Activation energy for the first order forward reaction will be independent of temperature.
Following table represents the type of reactions of three metals with various solutions. Metal lron (II) Sulphate Copper (II) Sulphate Zinc Sulphate A No reaction Displacement Not known B No reaction No reaction No reaction C Displacement Not known No reaction Which of the following represents the correct order of reactivity of metals A, B, C
If LIGHT is called MORNING, MORNING is called DARK, DARK is called NIGHT, NIGHT is called SUNSHINE and SUNSHINE is called DUSK, when do we sleep ?