Question67:-Astigmatism can be corrected using
‘AcGylindrical lens
B:-Convex lens
೦೦೦೧೭೫೪೬ lens
D:-Bifocal lens
Correct Answer:- ೦೧000
Question68:-In the modern periodic table, the period indicates the value of
‘AcAtomic number
B:-Atomic mass
೦91೧೮021 Quantum number
D-Azimuthal Quantum number
Correct Answer:- ೦೧000

Question69::Which of the following statements is incorrect in relation to ironization enthalpy 7
1. ironization enthalpy increases for each successive electron.

2. the penetration effect will not affect the ironization enthalpy

3. ironization enthalpy is the energy used for the withdrawal of an atom form its gaseous atom

4. Helium has the largest first ironization enthalpy.

Correct Answer: 8

Question70:-Alloy steels are prepared by adding other metal to steel. Stainless Steel, Alnico and Nichrome are the main alloys of steel. Which alloy/alloys is/are used for the production
of heating coil ?

AcAlnico
‏مع املق يق‎ and Nichrome
C:-Nichrome and Stainless Steel
D:-Nichrome
Correct Answer:- Option-D
Question71::With reference to the properties of crystalline solids, consider the following statements.
1. They have irregular shape
2.They melt at a sharp and characteristic temperature.
3. They gradually soften over a range of temperature.

4, When cut with a sharp edged tool, they split in to two pieces having generated plain and
‘smooth surfaces,

‎are TRUE‏ 4 2۸0 2ھ
‎Bel, 2 80ರ 4 are TRUE‏
‎೦೧/3 is TRUE‏
‎Deland 4 are TRUE‏
‎Correct Answer:- ೦೧000‏
‎Question72:-Consider the following statements in the context of hybridisation of chemical bonding.‏
‎The number of hybrid orbitals are equal to the number of the atomic orbitals that get hydribised.‏ .1
‎The hybridised orbitals are not equivalent in energy and shape‏ .2
‎The hybrid orbitals are more effective in forming stable bonds than the pure atomic orbitals.‏ .3
‎‘AcOnly Land 4 are correct‏
‎B:-Only 2 and 4 are correct‏
‎C-Only 1 and 3 are correct‏
‎ഷി the statements are correct‏
‎Correct Answer: Option-C‏
‎Question73:-Among the following, which are the Indian players, who won Gold medal in Olympics 2020 held in Tokyo 7‏

‎1. Ravikumar Dahiya