1
TS EAMCET 2023 (Online) 14th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A 100 W bulb emits light of wavelength

$x \mathop {\rm{A}}\limits^{\rm{o}} $. What is the value of $x$, if the number of photons emitted is $2.0 \times 10^{20} \mathrm{~s}^{-1}$ ?

$$ \left(h=6.63 \times 10^{-34} \mathrm{Js}, 1 \mathrm{~W}=1 \mathrm{Js}^{-1}\right) $$

A

3578

B

4978

C

3978

D

4578

2
TS EAMCET 2023 (Online) 14th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The ratio of the difference in energy between the first and second Bohr orbits to that between the second and third orbit is

A

$\frac{5}{27}$

B

$\frac{27}{5}$

C

$\frac{4}{9}$

D

$\frac{9}{4}$

3
TS EAMCET 2023 (Online) 14th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Assertion (A) First ionisation enthalpy of oxygen is less than that of nitrogen.

Reason (R) Atoms with half-filled or completely filled orbitals are less stable.

The correct option among the following is

A

(A) and (R) are true and (R) is the correct explanation of (A).

B

(A) and (R) are true, but (R) is not the correct explanation of (A).

C

(A) is true but (R) is false.

D

(A) is false but (R) is true.

4
TS EAMCET 2023 (Online) 14th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

In which of the following, molecules are arranged in the increasing order of their bond angles?

A

$\mathrm{NH}_3<\mathrm{SO}_2<\mathrm{H}_2 \mathrm{O}$

B

$\mathrm{H}_2 \mathrm{O}<\mathrm{NH}_3<\mathrm{SO}_2$

C

$\mathrm{SO}_2<\mathrm{NH}_3<\mathrm{H}_2 \mathrm{O}$

D

$\mathrm{SO}_2<\mathrm{H}_2 \mathrm{O}<\mathrm{NH}_3$

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