What are the different types of animal cells?
Blood cells, nerve cells, muscle cells, skin cells, fat cells are the different types of animal cells. You can read... View Article
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What is unique to plant cells?
Central vacuole, chloroplasts, cell wall, plastids are unique to plant cells. You can read about the Stems Cells – Types,... View Article
Do plant cells move?
Yes, plant cells can move relative to other cells, some parts of the cell can grow to new locations. You... View Article
What does a plant cell look like?
Plant cells usually have the shape of a cube or rectangle and the size of plant cells are similar. You... View Article
How can you identify an animal cell?
Animal cells do not have cell walls, will be round in shape and will have an outer cell membrane. You... View Article
18 Aug 2021: UPSC Exam Comprehensive News Analysis
August 18th, 2021, CNA:- Download PDF Here TABLE OF CONTENTS A. GS 1 Related B. GS 2 Related POLITY AND... View Article
The property not satisfied by the division of whole numbers is
Closure property is not satisfied by the division of whole numbers.
Two complementary angles differ by 10 degrees. Find the angles.
Let the first angle be x. Then its complementary angle will be 90 – x. The difference of the complementary... View Article
tan (cot-1 x) =
tan (cot-1 x) = tan [(π / 2) – tan-1 x] = cot (tan-1 x)
Solve y – 9 = 21 for the value of y.
y – 9 = 21 On adding 9 on both the sides, y – 9 + 9 = 21 +... View Article
The difference between the squares of two natural numbers is 45. The square of the smaller number is four times the larger number. Find the numbers.
Let the greater number be x and the smaller number be y. \(\begin{array}{l}x^{2}-y^{2}=45 \quad \ldots \ldots \ldots (i)\\ y^{2}=4 x... View Article
The value of a machine costing 80000 depreciates at the rate of 15% per annum. What will be the worth of this machine after 3 days?
Principal – 80000 Time – 3 days Rate – 15% per annum Deduction = P × R × T =... View Article
Solve the equation: 3 (x – 3) = 5 (2x + 1).
3 (x – 3) = 5 (2x + 1) ⇒ 3x – 9 = 10x + 5 ⇒ 7x =... View Article
What is the domain and range of y = cosec x?
Domain of y = cosec (x) is x ∈ R, x ≠ π ⋅ n, n ∈ Z Range of... View Article
The LCM of 54, 90 and a third number is 1890 and their HCF is 18 The third number is
LCM × HCF = product of the numbers \(\begin{array}{l}\Rightarrow 1890 \times 18=54 \times 90 \times x \\ \Rightarrow x=7 \\... View Article
Factorise:(i) 12x2 – 7x – 1(ii) 2x2 + 7x + 3(iii) 6x2 + 5x – 6(iv) 3x2 – x – 4
The given expressions are as follows. \(\begin{array}{l}(i) \ 12 x^{2}-7 x+1\\ =12 x^{2}-4 x-3 x+1\\ =4 \mathrm{x}(3 \mathrm{x}-1)-1(3 \mathrm{x}-1)\\ =(4... View Article
What percentage of a day is six hours and 45 minutes?
In a day, there are 24 hours. Six hours and 45 minutes = 6 (45 / 60) = 6 (3... View Article
1.3 (overline) is equal to
1.3 (overline) is expressed as 1.333333333….. 1.3 (overline) is equivalent to the fraction form 4 / 3.
Prove that the standard deviation of the first n natural numbers is √(n2 – 1) / 12.
Since \(\begin{array}{l}\Sigma n=\frac{n(n+1)}{2} \text { and } \Sigma n^{2}=\frac{n(n+1)(2 n+1)}{6} \\ S D=\sqrt{\frac{\Sigma x^{2}}{n}-\left(\Sigma \frac{x}{n}\right)^{2}} \\ =\sqrt{\frac{\Sigma n^{2}}{n}-\left(\frac{\Sigma n}{n}\right)^{2}} \\... View Article
One nautical mile is 6080 ft. The same in kilometre is?
The answer is as follows. \(\begin{array}{l}\text {1 nautical mile }=6080 \mathrm{ft} \\ 1 \mathrm{~km}=3280 \mathrm{ft} \\ \text {1 nautical mile... View Article
