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Question : Which odourless, colourless, tasteless and chemically unreactive gas was invented by Daniel Rutherford in 1772 and was independently isolated at the same time by Carl Wilhelm Scheele and Henry Cavendish?
Option 1: Nitrogen
Option 2: Argon
Option 3: Fluorine
Option 4: Oxygen
Correct Answer: Nitrogen
Solution : The correct answer is nitrogen.
The Scottish physician Daniel Rutherford discovered nitrogen. By isolating the particle in 1772, Rutherford found nitrogen. The element nitrogen has an atomic number of seven and the letter N as its symbol.
Question : Directions: In the following question, select the one different from the other three alternatives.
Option 1: 443
Option 2: 633
Option 3: 821
Option 4: 245
Correct Answer: 633
Solution : Let's check the options – First option: 443; 4 + 4 + 3 = 11 Second option: 633; 6 + 3 + 3 = 12 Third option: 821; 8 + 2 + 1 = 11 Fourth option: 245; 2 + 4 + 5 = 11
Question : Which of these is not true about the Green Revolution?
Option 1: It was funded by international agencies.
Option 2: It was a private-sector programme for agricultural modernisation.
Option 3: It was targeted mainly in the wheat and rice-growing areas.
Option 4: It was introduced only in areas that had assured irrigation.
Correct Answer: It was a private-sector programme for agricultural modernisation.
Solution : The correct option is It was a private-sector programme for agricultural modernisation.
The Green Revolution in India was not exclusively a private-sector programme; it involved a combination of public and private efforts to achieve agricultural modernisation. The Indian
Question : The first stable product of photosynthesis is
Option 1: Starch
Option 2: Sucrose
Option 3: Phosphoglyceric acid
Option 4: Glucose
Correct Answer: Phosphoglyceric acid
Solution : The correct option is Phosphoglyceric acid.
Photosynthesis's first stable product is "3-phosphoglycerate (3-PGA)" or "phosphoglyceric acid." This three-carbon chemical is created during the first stage of photosynthesis, known as the "Calvin cycle" or "light-independent reactions." It is an important step in the conversion of
Question : What is the value of $(1 ÷ 4) + (1 ÷ 6) - \left \{(1 ÷ 8) ÷ (1 ÷ 4) \right \}$?
Option 1: $-(11÷12)$
Option 2: $-(5÷12)$
Option 3: $-(7÷12)$
Option 4: $-(1÷12)$
Correct Answer: $-(1÷12)$
Solution : $(1 ÷ 4) + (1 ÷ 6) - \left \{(1 ÷ 8) ÷ (1 ÷ 4) \right \}$ $=(\frac{1}{4}) + (\frac{1}{6}) - {\frac{(\frac{1}{8})}{(\frac{1}{4})}}$ $=\frac{1}{4} + \frac{1}{6} - \frac{1}{2}$ $=\frac{3+2-6}{12}$ $=-\frac{1}{12}$ $= -(1÷12)$ Hence, the correct answer is $-(1÷12)$.
Question : If $6x^{2}-12x+1=0$, then the value of $27x^{3}+\frac{1}{8x^{3}}$ is:
Option 1: 162
Option 2: 189
Option 3: 207
Option 4: 225
Correct Answer: 189
Solution : Given: $6x^{^2}-12x+1=0$ Dividing by $2x$, we get $3x+\frac{1}{2x}=6$ Cubing both sides, $\left (3x \right)^{3}+\left (\frac{1}{2x} \right )^{3}+3\left (3x \right)\left (\frac{1}{2x}\right )\left (3x+\frac{1}{2x} \right )=6^{3}$ ⇒ $27x^{3}+\frac{1}{8x^{3}}+3\left (3\right )\left (\frac{1}{2} \right )\left (6\right )=6^{3}$ ⇒ $27x^{3}+\frac{1}{8x^{3}}=6^{3}-3\left (3\right)\left (\frac{1}{2}\right)\left (6\right)=189$ Hence, the correct answer is 189.
Question : Directions: Select the correct mirror image of the given figure when the mirror is placed at PQ as shown below.
Option 1:
Option 2:
Option 3:
Option 4:
Correct Answer:
Solution : As per mirror image properties, closer things appear closer to the mirror in reflection. According to the information provided, if the mirror is placed on the right side of the figure (on line PQ), the right of the reflected image will appear as the left, and
Question : Directions: Nisha is taller than Suja. Nina is taller than Nisha. Nila is taller than Nina. Misha is the tallest of all. If they stand according to their height, who will be in the middle?
Option 1: Nisha
Option 2: Nina
Option 3: Suja
Option 4: Nila
Correct Answer: Nina
Solution : Given: Nisha is taller than Suja. Nisha > Suja Nina is taller than Nisha. Nina > Nisha > Suja Nila is taller than Nina. Nila > Nina > Nisha > Suja Misha is the tallest of all. Misha > Nila > Nina > Nisha >
Question : A car, during its entire journey of 5 hours, travels the first 45 minutes at a certain speed, the next 75 minutes at a speed of 85 km/hr, and the last 3 hours at a speed of 70 km/hr. During its entire journey, the average speed of the car is found to be 73 km/hr. What is the speed (in km/hr) of the car during the first 45 minutes?
Option 1: 65
Option 2: 68
Option 3: 62
Option 4: 72
Correct Answer: 65
Solution : Let the speed in the first 45 minutes be $x$ km/hr and the total distance be $y$. First 45 minutes = $\frac{45}{60}$ hours = 0.75 hours Next 75 minutes = $\frac{75}{60}$ hours = 1.25 hours Last 3 hours = 3 hours Now, Distance covered for
Question : Directions: Select the correct mirror image of the given figure when the mirror is placed at MN as shown below.
Solution : As per the mirror image properties, closer things appear closer to the mirror in the reflection. Here, according to the information provided, the mirror is placed on the right side of the figure (on line MN). So, the left side of the reflected image will appear
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