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TS Polycet (Polytechnic) 2021 Previous Question Paper with Answers And Model Papers With Complete Analysis

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91)In an atom, when electron jump from ground state excited state

A) no change in energy

B) energy is emitted

C) energy is absorbed

D) depends on atom

View Answer

C) energy is absorbed
Explanation:When an electron jumps from ground to excited state, it absorbs energy.
Answer: Energy is absorbed

92)The orbital which is filled with electrons immediately after '3p' is

A) 4s

B) 3d

C) 4f

D) 4p

View Answer

A) 4s
Explanation:After 3p, the next orbital filled (according to the Aufbau principle) is 4s.
Answer: 4s

93)When n = 4, the total number of subshells in an orbit is

A) 1

B) 4

C) 2

D) 3

View Answer

B) 4
Explanation:For n = 4, the number of subshells = n⇒ 4 subshells: 4s, 4p, 4d, 4f
Answer: 4

94)Which of the following has larger wavelength in electromagnetic spectrum

A) Gamma rays

B) UV rays

C) X-rays

D) Radio waves

View Answer

D) Radio waves
Explanation:In EM spectrum, radio waveshave the longest wavelength.
Answer: Radio waves

95)The quantum number which explains about the special orientation of orbitals is

A) n

B) l

C) m₁

D) m_s

View Answer

C) m₁
Explanation:Magnetic quantum number (m₁)explains orientationof orbitals in space.
Answer: m₁

96)The correct set of four quantum number values for the valence electron of sodium atom is

A) n=3,1=1,m=1,s= $-\frac12$

B) n=3,1=0,m=0,s= $+\frac12$

C) n=3,1=0,m=1,s= $+\frac12$

D) n=3,1=1,m=0,s= $-\frac12$

View Answer

B) n=3,1=0,m=0,s= $+\frac12$

Explanation:Sodium's valence electron: atomic number 11 → electron in 3s¹ ⇒n = 3, l = 0, m = 0, s = +½
Answer: n=3, l=0, m=0, s=+½

97)The impurities present in the ore is called as

A) Flux

B) Gangue

C) Slag

D) Mineral

View Answer

B) Gangue
Explanation:Impurities in ore = gangue
Answer: Gangue

98)Which of the following is used as a flux in the smelting of Haematite

A) SiO₂

B) CaSiO₃

C) CaCO₃

D) FeSiO₃

View Answer

C) CaCO₃
Explanation:In smelting haematite, CaCO₃acts as a fluxto remove SiO₂.
Answer: CaCO₃

99)Potassium and Calcium belongs to

A) s-block elements

B) p-block elements

C) d-block elements

D) f-block elements

View Answer

A) s-block elements
Explanation:Potassium (K) and Calcium (Ca) are in Group 1 and 2 respectively → s-block
Answer: s-block elements

100)Which of the following is an ore of Iron

A) Bauxite

B) Haematite

C) Carnallite

D) Pyrolusite

View Answer

B) Haematite
Explanation:Haematite (Fe₂O₃)is an important ore of iron.
Answer: Haematite

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