1
TS EAMCET 2022 (Online) 18th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

In hydrogen atom, the minimum energy required to excite an electron from 2nd orbit to the 3rd orbit is

A

2.2 eV

B

2.7 eV

C

1.9 eV

D

7 eV

2
TS EAMCET 2022 (Online) 18th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

The velocity $(v)$ of de-Broglie wave is given by

$$ \left[\begin{array}{l} v=\text { frequency } \\ m=\text { mass } \\ C=\text { velocity } \text { of } \text { light } \end{array}\right] $$

A

$m C^2$

B

$v \lambda$

C

$\frac{h v}{\mathrm{mC}}$

D

$\frac{C^2}{v}$

3
TS EAMCET 2022 (Online) 18th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

How many of the following statements are correct?

(A) ' $\mathrm{He}^{\prime}$ ' is the second most abundant element in the universe.

(B) The symbol for the element with atomic number 110 is Ds.

(C) Osmium has the highest density among all elements.

(D) Francium is the most electropositive element in the periodic table.

A

3

B

2

C

4

D

1

4
TS EAMCET 2022 (Online) 18th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

The correct order of the first ionisation enthalpies of the following elements is

A

$\mathrm{Li}<\mathrm{B}<\mathrm{Be}<\mathrm{N}$

B

$\mathrm{Li}<\mathrm{Be}<\mathrm{B}<\mathrm{N}$

C

$\mathrm{N}<\mathrm{Be}<\mathrm{B}<\mathrm{Li}$

D

$\mathrm{N}<\mathrm{B}<\mathrm{Be}<\mathrm{Li}$

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