Given:

Total money spent is Rs. 273

The total no. of Pens and Pencils is 50

The price of pen and pencil is Rs. 6 and Rs. 5 respectively

Solution:

Let no. of pens and pencils be x, y

=> 6x + 5y = 273 → (1)

=> x + y = 50 → (2)

(1) – 5 × (2)

=> x = 273 - 250 = 23

∴ The total number of pens he bought is 23

Given:

A, B, C, D and E are sitting on a bench.

A and B are sitting next to each other and so are C and D.

D is sitting at the extreme left end of the bench and A is sitting at the centre.

E is sitting next to B.

From the given information seating arrangement will be.

A sitting between B and C.

Thus, correct option is (d).

The correct embedded figure is shown below:

Thus, the correct option is (d)

​Given:​

A = 50578

t = 2.5 years

r = 12% per annum

Interest is compounded every 10 months

Formula Used:

P = 38000

Correct Answer is: Neon

The Correct Answer is: (c) Neon Explanation: The second shell (L-shell) can hold a maximum of 8 electrons. Neon (atomic number 10) has an electron configuration of 2,8. Therefore, its L-shell is completely filled, making it chemically inert.

Information Booster: • Electron configuration of Neon: 2 in K-shell + 8 in L-shell. • Filled outermost shell leads to zero valency. • Noble gases have completely filled valence shells. • Neon is a monoatomic gas and chemically inactive. • It is used in advertising signs (neon lights).

Additional Information: • (a) Oxygen – Atomic number 8 → config 2,6 → L-shell not full. • (b) Nitrogen – Atomic number 7 → config 2,5. • (c) Neon – Correct, 2,8 electron configuration. • (d) Fluorine – Atomic number 9 → config 2,7 → needs 1 electron to complete octet.

The correct answer is (A) Carbon dioxide

Explanation:

Carbon dioxide (CO2) is the gas that is necessary for the process of photosynthesis. During photosynthesis, plants take in carbon dioxide from the atmosphere through small openings in their leaves called stomata.

Using sunlight and chlorophyll, plants convert carbon dioxide and water into glucose (a form of sugar) and oxygen. This process is essential for plant growth and provides oxygen, which is vital for most living organisms.

Information Booster:

• Carbon dioxide is a key reactant in photosynthesis, alongside water and sunlight.
• During photosynthesis, carbon dioxide is converted into glucose, a form of energy for plants.
• The overall equation for photosynthesis is:
  6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂
• Photosynthesis is critical for the production of oxygen, supporting life on Earth.

Additional Information:

• Sulphur trioxide (SO3): Sulphur trioxide is a toxic gas, It is usually formed in the combustion of sulfur-containing materials.
• Nitrogen dioxide (NO2): This gas is a pollutant, It is harmful to plants and animals in high concentrations.
• Sulphur dioxide (SO2): Sulphur dioxide is also a harmful pollutant and does not participate in photosynthesis. It can damage plant cells and hinder photosynthetic efficiency.

Given:

Number: 56789214

Solution:

56789214= 50000000+6000000+700000+80000+90000+200+10+4

Place value of 5 = 50000000 

Given:

If 'X + Y' means 'X is the brother of Y', 'X × Y' means 'X is the father of Y' and 'X / Y' means 'X is the mother of Y'.

Now, we check each options.

Option (a): S × T × R

Option (b): S /R /T

Option (c): S × R + T

Option (c) is the following would mean 'R is the son of S'.

Thus, correct option is (c).

Given:

The three angles of a triangle.

One angle is twice the smallest angle.

Another angle is thrice the smallest angle.

Concept Used:

The sum of the angles of a triangle is always 180⁰

Solution:

Let the smallest angle be x. Then:

The second angle is 2x (twice the smallest).

The third angle is 3x (thrice the smallest).

The correct answer is: (b) Carbon dioxide

Explanation:

Dry ice is made by liquefying carbon dioxide (CO₂) and then allowing it to expand rapidly, which causes it to freeze into a solid.

It is called "dry" ice because it does not melt into a liquid but instead sublimates directly from a solid to a gas at room temperature.

It is colorless, odorless, and heavier than air.​

Information Booster:

• Dry ice is solid carbon dioxide (CO₂), which sublimates at -78.5°C (−109.3°F).

• It is commonly used for cooling purposes, especially in shipping perishable items like food and medicine.

• Dry ice is also used in fog machines for special effects in theaters and films.

• It is used for cleaning in some industrial applications through a process called dry ice blasting.