π₯3
π5
A pure substance which contains only one type of atom is called βββββ.
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71%
An element
17%
An compound
10%
A solid
2%
A liquid
π₯4
π3π₯°2
The number of significant figures in 6.02 x 1023 is ββββ
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18%
23
48%
3
28%
4
6%
26
π±11
π1π₯°1
π3π1
π1π1
The displacement in metres of a body varies with time t in second as y = t2 β t β 2. The displacement is zero for a positive of t equal to
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22%
1s
53%
2s
18%
3s
6%
4s
A 180 metre long train is moving due north at a speed of 25 m/s. A small bird is flying due south, a little above the train, with a speed of 5 m/s. The time taken by the bird to cross the train is
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23%
3s
44%
6s
27%
9s
7%
12s
π2
A body starts from rest and travels for t second with uniform acceleration of 2 m/sΒ². If the displacement made by it is 16 m, the time of travel t is
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27%
4s
37%
9s
29%
5s
7%
7s
π4π1