Correct Answer: 20 percent

Solution : According to the question,
Marked Price = 150% of cost price
$\therefore$ $\text{MP} = 1.5\text{C}$
After a 20% discount, the selling price (SP) is given by:
SP $=$ Marked Price $−$ Discount
⇒ SP $=1.5\text{C}−0.2\times1.5\text{C}=1.2\text{C}$
⇒ Profit $=$ SP $−$ CP $=1.2\text{C}−\text{C}=0.2\text{C}$
Profit Percentage = $\frac{\text{Profit}}{\text{Cost Price}}\times 100$
$=\frac{0.2\text{C}}{C}\times 100$%
⇒ Profit Percentage = 20%
Hence, the correct answer is 20 percent.

Correct Answer: 4

Solution : Given: $2x+3y=k$
If (2, 0) is a solution of the linear equation $2x+3y=k$
Putting $x = 2$ and $y = 0$ to get:
⇒ $2(2)+3(0) = k$
$\therefore k = 4$
Hence, the correct answer is 4.

Correct Answer: Energy

Solution : The correct answer is Energy.

Planck's constant (ℎ) has dimensions of energy multiplied by time. In terms of units, it is commonly expressed in joule-seconds (J·s) in the International System of Units (SI). It can be expressed as [ℎ] = [E] × [t] where:

[ℎ} is the dimension of Planck's Constant,
[E] is the dimension of energy,
[t] is the dimension of time.

Correct Answer:

Solution : When the given folded paper is unfolded, it will look like –

Hence, the third option is correct.

Correct Answer: neutrality towards power blocks

Solution : The correct answer is neutarilty towards power blocks.

Non-alignment movement was started by Indian Prime Minister Jawahar Lal Nehru, President of Egypt Gamal Abdel Nasser and others. Non alignment means not aligning with any of the power blocks which emerged after the second World War. In the aftermath of second World War, the world was ideologically divided into two power blocks led by USA and USSR. The newly independent nations at that time decided to maintain political neutrality and not to align with any of the power blocks and to maintain their sovereignty.

Correct Answer: 4

Solution : The prime factors of 76050 are 2, 3, 5, and 13.
76050 = 2¹ × 3² × 5² × 13²
So, 76050 is not divisible by 4 out of the given options.
Hence, the correct answer is 4.

Correct Answer: 1st July

Solution : The correct answer is 1st July.

Van Mahotsav Day is celebrated every year in the first week of July that is, from July 1 to July 7. It was initiated in 1950 by K. M. Munshi, then Union Minister of Agriculture and Food, to spread environmental awareness, and increase local participation in plantation drives to save Mother Earth. It is also known as Forest Week.

Correct Answer: 4 : 5 : 11

Solution : P invests $\frac{1}{5}$th of the total investment.
Q invests $\frac{1}{4}$th of the total investment.
Taking, LCM (4, 5) = 20
Let the total investment be Rs. 20
P invests $\frac{1}{5}$th of the total investment = $\frac{1}{5}\times 20$ = Rs. 4
Q invests $\frac{1}{4}$th of the total investment = $\frac{1}{4}\times 20$ = Rs. 5
Thus R invests = Rs. 20 – (Rs. 4 + Rs. 5) = Rs. 20 – Rs. 9 = Rs. 11
Thus the ratio of the profit of P, Q, and R respectively is 4 : 5 : 11.
Hence, the correct answer is 4 : 5 : 11.

Correct Answer: Sodium

Solution : The correct option is Sodium

Sodium is an element with a higher atomic number than fluorine. Sodium has an atomic number of 11 and Fluorine's atomic number is 9. 

Correct Answer: 100 km

Solution : Speed of train = 50 km/hr
Speed of walking = 10 km/hr
Total time for journey = 12 hours
Let the distance to be covered be $d$ km.
Time taken by train = $\frac{d}{50}$
Time taken by walking = $\frac{d}{10}$
According to the question :
$⇒ \frac{d}{50} + \frac{d}{10} = 12$
$⇒ 6d = 50 × 12$
$⇒ d = 100$ km
Hence, the distance travelled by train is 100 km.
Hence, the correct answer is 100 km.