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Question 1. Why is the red color selected for danger signal lights? Answer: The wavelength of red light is the longest in visible light, so the red color is scattered the least by air molecules of...
Question 1. How is the increase in demand for energy affecting our environment adversely? Answer: As the population increases, so does their demand for energy. More and more of fossil fuels are being...
Question 1. From amongst the metals sodium, calcium, aluminium, copper and magnesium, name the metal. (a) which reacts with water only on boiling, and (b) another which does not react even with...
S Chand Biology Class 10 Solutions Multiple Choice Questions (MCQs) Question 1. In the sketch of the stomatal apparatus given alongside, which one of the following is missing? (1) Cell membranes of...
When discussing Indian school-level science education, the works of Lakhmir Singh and Manjit Kaur hold significant prominence. Especially notable are their science textbooks for the Central Board of...
When discussing Indian school-level science education, the works of Lakhmir Singh and Manjit Kaur hold significant prominence. Especially notable are their science textbooks for the Central Board of...
[mathjax] Question 1 Let S=|1,2.3|. Determine whether the functions $f: S \rightarrow S$ defined as below have inverse. Find $f^{-1}$ if it exists. (i) $f=\{(1,2),(2,1),(3,1)\}$ (iii)...
[mathjax] Question 1 If the functions f and g are given by $\begin{aligned}&f=\{(1,2),(3,5),(4,1)\} \\&g=\{(2,3),(5,1),(1,3)\}\end{aligned}$ then define fog and gof Sol : Question 2 Let $A=\{1,2,3\},...
[mathjax] Question 1 Let A={1,2,3}, B={4,5,6,7} and let f={(1,4),(2,5),(3,6)} be a function from A to B. Show that f is one-one. Sol : Question 2 Let $f: N \rightarrow N$ be defined by $f(x)=2 x$....
When discussing Indian school-level science education, the works of Lakhmir Singh and Manjit Kaur hold significant prominence. Especially notable are their science textbooks for the Central Board of...
[mathjax] [using elementary transformations (operations), find the inverse of the following matrices, if it exist] Question 1 $\begin{bmatrix}1&3\\2&7\end{bmatrix}$ Sol :...
[mathjax] Question 2 यदि (if) $A=\left[\begin{array}{r}3 \\ 1 \\ -2\end{array}\right]$ , $B=\left[\begin{array}{lll}1 & -5 & 7\end{array}\right]$ तो सत्यापित करें (verify that) (AB)'=B'A' Sol : $A...