1
CBSE 12th Physics Outside Delhi Set 1 - 2023
MCQ (Single Correct Answer)
+1
-0

A hydrogen atom makes a transition from $$n=5$$ to $$n=1$$ orbit. The wavelength of photon emitted is $$\lambda$$. The wavelength of photon emitted when it makes a transition from $$n=5$$ to $$n=2$$ orbit is

A
$$\frac{8}{7} \lambda$$
B
$$\frac{16}{7} \lambda$$
C
$$\frac{24}{7} \lambda$$
D
$$\frac{32}{7} \lambda$$
2
CBSE 12th Physics Outside Delhi Set 1 - 2023
MCQ (Single Correct Answer)
+1
-0

The curve of binding energy per nucleon as a function of atomic mass number has a sharp peak for helium nucleus. This implies that helium nucleus is

A
radioactive
B
unstable
C
easily fissionable
D
more stable nucleus than its neighbours
3
CBSE 12th Physics Outside Delhi Set 1 - 2023
MCQ (Single Correct Answer)
+1
-0

In an extrinsic semiconductor, the number density of holes is $$4 \times 10^{20} \mathrm{~m}^{-3}$$. If the number density of intrinsic carriers is $$1.2 \times 10^{15} \mathbf{m}^3$$, the number density of electrons in it is

A
$$1.8 \times 10^9 \mathrm{~m}^{-3}$$
B
$$2.4 \times 10^{10} \mathrm{~m}^{-3}$$
C
$$3.6 \times 10^9 \mathrm{~m}^{-3}$$
D
$$3.2 \times 10^{10} \mathrm{~m}^{-3}$$
4
CBSE 12th Physics Outside Delhi Set 1 - 2023
MCQ (Single Correct Answer)
+1
-0

Pieces of copper and of silicon are initially at room temperature. Both are heated to temperature T. The conductivity of

A
both increases.
B
both decreases.
C
copper increases and silicon decreases.
D
copper decreases and silicon increases.
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