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(A) Atmospheric refraction

Correct option is: (c) 5 : 00 pm

It is disorderness of the system. Entropy increases.

Following are the difference between intrinsic semiconductor and extrinsic semiconductors— Intrinsic Semiconductors

1. They are the crystals of pure elements like germanium and silicon.

2. M_e = n_h

3. The electrical conductivity of intrinsic semiconductor is law.

4. Resistivity is higher

Extrinsic Semiconductors

1. When some impurity is added in the intrinsic semiconductor, we get an extrinsic semiconductor.

2. M_e ≠ n_h

3. Its electrical conductivity is high. 

4. Resistivity is lower.

The correct answer is: (b) 3

The correct answer is: (d) 5

(a) Acceptor atoms

(c) Only those produced by thermal energy.

The correct answer is: (c) n-type

The Russo-Ukrainian War is an ongoing war, primarily involving Russia, Belarus and pro-Russian forces on one side, and Ukraine on the other. Armed conflict began in February 2014 in the wake of Euro maidan, centred on the status of Crimea and the parts of Donbas which are internationally recognized as part of Ukraine. The conflict had included the Russian annexation of Crimea(2014) the Donbas war(2014- present) naval incidents, cyberwarfare, and political tensions. After Russia military build-ups near Ukraine's borders in 2021, Russia launched a large scale invasion of Ukraine on 24th February 2022. Following the Euro maidan  protests and the subsequent removal of Ukrainian President Viktor Yanukovych on 22 February 2014, and amidst pro - Russian unrest in Ukraine, Russian soldiers without insignias took control of strategic positions and infrastructure within the Ukrainian territory of Crimea. On 1 March 2014, the Federation Council of the Russian Federation unanimously adopted a resolution to petition Russian President Vladimir Putin to use military force in Ukraine. The resolution was adopted several days later, after the start of the Russian military operation on the "Returning of Crimea". Russia then annexed Crimea after a widely criticized local referendum which was organized by Russia after the capturing of the Crimean Parliament, whose outcome was for the Autonomous republic of Crimea to join the Russian Federation.   In April, demonstrations by pro-Russian groups in the Donbas area of Ukraine escalated into a war between the Ukrainian government and the Russian-backed separatist forces of the self-declared Donestk and Luhansk People republics. In August, Russian military vehicles crossed the border in numerous locations of Donetsk Oblast. The incursion by the Russian military was seen as responsible for the defeat of Ukrainian forces in early September. 

Answer is (4) 10 cm

L = f₀ + f_e = 60 cm 

M = f₀/f_e = 5

f₀ = 5f_e

∴ 6f_e = 60 cm

f_e = 10 cm

Answer is (4) 10 cm

m = f₀/f_e

5 = f₀/f_e

f₀ = 5f_e

f₀ + f_e = 60 

6f_e = 60 

f_e = 10 

(a)Place the two prisms beside each other. Make sure that their bases are on the opposite sides of the incident white light, with their faces touching each other. When the white light is incident on the first prism, it will get dispersed. When this dispersed light is incident on the second prism, it will recombine and white light will emerge from the combination of the two prisms. 

(b)Take the system of the two prisms as suggested in answer (a). Adjust (increase) the angle of the flint-glass-prism so that the deviations due to the combination of the prisms become equal. This combination will disperse the pencil of white light without much deviation.

Correct option is (C) 260 K

The efficiency of carnot engine \(\eta\) = 1 - \(\frac{T_2}{T_1}\)

.35 = 1 - \(\frac{T_2}{400}\) 

\(\frac{T_2}{400}=1-0.35\) 

\(\frac{T_2}{400}=0.65\) 

T₂ = \(\frac{0.65}{100}\times400\)

T₂ = 260 K

The correct answer is Sriharikota.

• Chandrayaan-1 was India's first lunar probe launched by the Indian Space Research Organisation in October 2008, and it was operated until August 2009.
• It was launched from Satish Dhawan Space Centre, Sriharikota, Island in Andhra Pradesh.
  • Sriharikota is a barrier island off the Bay of Bengal coast.
• The spacecraft was orbiting around the Moon at a height of 100 km from the lunar surface for chemical, mineralogical, and photo-geologic mapping of the Moon.
• Launch Vehicle: PSLV-C11
• Application: Planetary Observation

• India's second mission to the Moon, Chandrayaan-2 was launched on 22nd July 2019 from Satish Dhawan Space Center, Sriharikota.
• The GSLV Mk-III will carry Chandrayaan 2 to its designated orbit.
• Chandrayaan-2 is an Indian lunar mission that will boldly go where no country has ever gone before the Moon's south polar region.
• India will become the fourth country in the world to soft-land on the lunar surface, a feat previously accomplished by only three other countries - the US, Russia, and China.
• Chandrayaan-2 consists of three components: the Orbiter, the Lander (Vikram), and the Rover (Pragyaan).
• The Lander of Chandrayaan 2 is named Vikram after Dr. Vikram A Sarabhai, the Father of the Indian Space Programme.

• Another Satellite launch station, which ISRO operates is the Thumba Equatorial Rocket Launch Station (TERLS) located at Thiruvananthapuram in Kerala.
• Vikram Sarabhai Space Centre (VSSC), Thiruvananthapuram, is the lead center of ISRO responsible for the design and development of launch vehicle technology.
  • It was then renamed after Dr. Vikram Sarabhai who is known as the Father of the Indian space program.
• Dr. Abdul Kalam Island, formerly known as Wheeler Island, is located on the coast of Odisha.
  • This island is considered one of the Country’s most advanced missile testing ranges.

Correct answer is c) Clean water and sanitation 

1. Hepatic portal system 

2. Renal portal system 

3. CAD – Coronary Artery Disease

Correct option is (3) Monera

a) It dilates cerebral vessels and improves blood supply

d) All the above 

c) Plasmoexpanders

b) Stimulation of the metabolic processes in neurons

a) Alfa-adrenoreceptors (leads to peripheral vasoconstriction) 

b) Pyracetam

c) Ergotamine

b) Dopamine receptors (leads to vasodilation of renal and mesenterial vessels)

a) Aminalon, Picamilon

c) Positive inotropic drugs

GIVEN:

Efficiency ratio of Suman and Sumit is 2 : 3.

They got Rs. 150 for the work

CONCEPT:

Efficiency is inversely proportional to time.

And

Ratio of amount = Ratio of efficiency

CALCULATION:

Amount of money received by Suman = 150 × 2/5 = Rs. 60

GIVEN:

A can do half of the work in 5 days and B can do 1/3^rd of the work in 6 days.

CONCEPT:

Efficiency is inversely proportional to time.

And
Ratio of amount = Ratio of efficiency

CALCULATION:

Time in which A will complete the whole work = 5 × 2 = 10 days

And

Time in which B will complete the whole work = 6 × 3 = 18 days

So,

Ratio of efficiencies of A and B = 18 : 10 = 9 : 5

Hence,

GIVEN:

A and B can do a work in 6, 8 days respectively. Doing that work together, they get an amount of Rs. 700.

CONCEPT:

Ratio of amount = Ratio of efficiency

CALCULATION:

Efficiency ratio is inversely proportional to the Time

Then

Efficiency ratio = 8 : 6 = 4 : 3

Hence,

B’s share = (700 × 3)/7 = Rs. 300

Given:

P and Q earns = Rs. 250

Q and R earns = Rs. 220

P, Q, and R together earns 350

Calculation

P + Q = 250     ----(1)

Q + R = 220     ----(2)

Add eq. (1) and eq. (2)

⇒ P + Q + Q + R = 470

⇒ P + Q + R + Q = Rs. 470     ----(3)

P + Q + R = 350     ----(4)

Put value of P, Q, and R from eq. (4) to eq. (3)

⇒ 350 + Q = 470

⇒ Q = Rs. 120

∴ Daily earing of Q is Rs. 120

GIVEN:

8 boys working 4 hours a day earn Rs. 320.

FORMULA USED:

(B1 × D1)/W1 = (B2 × D2)/W2

CALCULATION:

By using the formula:

8 × 4 × W2 = 7 × 2 × 320