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i. The apparent movement of the sun due to the inclination of axis is the reasons for the occurrence of different seasons. The sun’s rays fall vertically over one hemisphere during one half of the year and on the other hemisphere during the other half. When the sun rays fall vertically in the Northern Hemisphere, it is summer in the Northern Hemisphere and winter in the Southern Hemisphere. Similarly, when the sun rays fall vertically over the Southern Hemisphere, it is summer in the Southern Hemisphere and winter in the Northern Hemisphere.

ii. Reasons for the occurrence of seasons:

• Earth’s revolution 
• Inclination of axis 
• Migration of the sun

• Spring and autumn. 
• In Northern Hemisphere, spring season is experienced between 21 March and 21 June. This is the season of transition from winter to summer.
• Autumn is experienced in the Northern Hemisphere from 23 September to 22 December. It marks the transition from summer to winter.

Provides quick access to information such as medical information, open a location, map or a webpage, posted next to paintings or museum items to display information about the item, on grocery items to display ingredients/nutritional information.

Contact refurbishing firm – they may pay something for the old computers to refurnish them or use the part to refurbish other computers.

Contact a recycling firm to dispose of them in an environmentally responsible way.

It has a battery and can run on battery power when not connected to electricity, saves space.

d) Xylometazoline

The correct answer is India.

• India has been removed from the 'Currency Monitoring List' of major trading partners by the US Treasury Department in 2019.

• Switzerland was the other nation that was removed by the US from its currency monitoring list.
• India was removed because it met only one out of three criteria in a significant bilateral surplus with the US for two consecutive reports.
• After purchasing foreign exchange on the net in 2017, the central bank steadily sold reserves for most of 2018, with net sales of foreign exchange reaching 1.7 percent of GDP over the year.
  • India maintained ample reserves according to the IMF metrics for reserve adequacy.
  • Neither Switzerland nor India met the criteria for having engaged in persistent, one-sided intervention in either the October 2018 report

Correct option is (b) Steel 

(a) less than 

 (b) C = \(\sqrt{γRT}\)

(b) less than unity 

Correct option is (b) 0.3 

Pressure, p = 88.3 kN/m² 

Temperature, T = – 2 + 273 = 271 K 

Mach angle, M = 40° 

γ = 1.4, R = 287 J/kg K 

Velocity of the projectile, V : 

Sonic velocity, C = \(\sqrt{γRT}\) = \(\sqrt{1.4\times287\times271}\) = 330 m/s

Now, sin α = \(\cfrac CV\) or sin 40° = \(\cfrac {340}V\)

V = \(\cfrac{330}{sin 40°}\) = 513.4 m/s

Correct answer is Thangta

1.33 is relative refractive index of n_yx. 

Net heat lost = Net heat gain.

The reciprocal of focal length is called "power of lens".

Refractive index of diamond = (Speed of lightin air/Speed of light in diamond)

= (3.00,000/1,24,000) = 2.42.

We know that

P₁ = \(\frac{F_1}{A_1}\) 

then P₂ = P₁

_{\(\frac{F_2}{A_2}=\frac{F_1}{A_1}\)} 

_{\(F_2 = A_2\times\frac{F_1}{A_1}\)} 

_{\(F_2=\pi r_2^2 \times \frac{F_1}{\pi r_1^2}\)} 

_{\(F_2=F_1(\frac{r_2}{r_1})^2\)} 

\(F_2 = 1600\times(\frac{0.04}{0.01})^2\)

\(F_2 = 1600\times16\) 

F₂ = 25600 N

Correct option is B) address

HF is a weak acid still it is capable of reacting with glass. This is because of the fact that HF reacts with SiO₂  to form [SiF₆]^2- ions which is quite stable. 

Hence, in order to store HF, we use wax-coated glass bottles.  

The equation for above reaction is as follows: 

SiO₂ + 6HF → [SiF₆]^2-  + 2H⁺  + 2H₂O 

Hydrolysis is the process of adding water to a molecule for the purpose of breaking it into simpler compounds. In partial hydrolysis, the amount of water added is limited. 

XeF4 on partial hydrolysis produces xenon oxyfluoride (XeOF₂). 

This reaction can be symbolically given as: 

XeF₄ + H₂O -> XeOF₂ + 2HF.