If a snail is at the bottom of a 20-foot well, and it climbs 3 feet up the well each day, but slides back 2 feet at night, how many days will it take for the snail to reach the top of the well?
A. 18 days
B. 20 days
C. 22 days
D. 25 days
Correct Answer: B The snail climbs 3 feet up and slides back 2 feet, so it effectively climbs 1 foot per day. To climb 20 feet, it will take 20 - 1 = 19 days to climb 19 feet, and on the 20th day, it will climb the final foot to reach the top.
Q2. [+2, -0.25]General Knowledge
Who is the author of the book 'India After Gandhi'?
A. Ramachandra Guha
B. Narendra Modi
C. Jawaharlal Nehru
D. Mahatma Gandhi
Correct Answer: A Ramachandra Guha is the author of the book 'India After Gandhi: The History of the World's Largest Democracy'.
Q3. [+2, -0.25]Science
What type of rock is formed from the cooling and solidification of magma?
A. Sedimentary
B. Igneous
C. Metamorphic
D. Foliated
Correct Answer: B Igneous rocks are formed from the cooling and solidification of magma or lava.
Q4. [+2, -0.25]Reasoning
If A is the father of B and C is the mother of B, what is the relationship between A and C?
A. Brother and Sister
B. Husband and Wife
C. Father and Daughter
D. Mother and Son
Correct Answer: B Since A is the father of B and C is the mother of B, A and C must be husband and wife.
Q5. [+2, -0.25]Mathematics
What is the formula for the volume of a cube?
A. V = 1/2 lwh
B. V = lwh
C. V = s^3
D. V = 1/3 πr^2h
Correct Answer: C The formula for the volume of a cube is V = s^3, where V is the volume and s is the length of a side of the cube.
Q6. [+2, -0.25]Reasoning
If A is 3 years older than B, and C is 2 years younger than B, what is the relationship between A and C?
A. A is 1 year older than C
B. A is 5 years older than C
C. A is 3 years younger than C
D. A is 2 years younger than C
Correct Answer: B If A is 3 years older than B, and C is 2 years younger than B, then A is 3 + 2 = 5 years older than C.
Q7. [+2, -0.25]General Knowledge
In the Indian Olympic Games 2024, which sport did India win its first gold medal in?
A. Archery
B. Badminton
C. Boxing
D. Weightlifting
Correct Answer: C India secured its first gold in boxing at the 2024 Indian Olympic Games, marking a historic achievement.
Q8. [+2, -0.25]Reasoning
A bat and a ball together cost $1.10. The bat costs $1.00 more than the ball. How much does the ball cost?
A. $0.05
B. $0.10
C. $0.15
D. $0.20
Correct Answer: A Let's say the ball costs x cents. Since the bat costs $1.00 more than the ball, the bat costs x + $1.00. The total cost is $1.10, so we can set up the equation: x + (x + $1.00) = $1.10. Simplifying the equation, we get 2x + $1.00 = $1.10. Subtracting $1.00 from both sides gives us 2x = $0.10. Dividing both sides by 2 yields x = $0.05.
Q9. [+2, -0.25]Science
Which gas is primarily responsible for the greenhouse effect?
A. Oxygen
B. Nitrogen
C. Carbon Dioxide
D. Argon
Correct Answer: C Step 1: The greenhouse effect is caused by certain gases trapping heat in Earth's atmosphere. CO is the most significant human-emitted greenhouse gas.
Step 2: While water vapor is the most abundant natural greenhouse gas, CO is the primary driver of anthropogenic (human-caused) climate change.
Shortcut Trick: 'CO = Climate Offender x 2'. Remember the main greenhouse gases with 'COW-FAN': CO, O (ozone), Water vapor, F-gases, Aerosols, NO (nitrous oxide), CH (methane). CO is #1 culprit because it stays in the atmosphere for 300-1000 years.
Key Composition of Atmosphere:
- Nitrogen (N): ~78% - NOT a greenhouse gas
- Oxygen (O): ~21% - NOT a greenhouse gas
- Argon (Ar): ~0.93% - NOT a greenhouse gas
- CO: ~0.04% - though tiny, it's the PRIMARY greenhouse gas due to its heat-trapping ability
Common Mistake: Students think oxygen or nitrogen cause the greenhouse effect since they make up 99% of the atmosphere. But greenhouse gases are trace gases that absorb and emit infrared radiation. O and N are transparent to infrared - they don't trap heat.
Q10. [+2, -0.25]General Knowledge
Who is the founder of the company 'SpaceX'?
A. Elon Musk
B. Jeff Bezos
C. Bill Gates
D. Mark Zuckerberg
Correct Answer: A Elon Musk is the founder, CEO, and CTO of SpaceX, a private aerospace manufacturer and space transport services company.
Q11. [+2, -0.25]Reasoning
If A is the father of B and C is the mother of B, what is the relationship between A and C?
A. Brother and Sister
B. Husband and Wife
C. Father and Daughter
D. Mother and Son
Correct Answer: B Given that A is the father of B and C is the mother of B, it implies that A and C are married, hence they are husband and wife.
Q12. [+2, -0.25]Reasoning
If a bakery sells 250 loaves of bread per day and each loaf costs $2, how much money does the bakery make in a day?
A. $450
B. $500
C. $550
D. $600
Correct Answer: B The bakery sells 250 loaves of bread per day at $2 each, so the total amount of money made in a day is 250 * $2 = $500.
Q13. [+2, -0.25]Science
What is the smallest bone in the human body?
A. Femur
B. Tibia
C. Stapes
D. Cranium
Correct Answer: C The stapes bone, one of the bones in the middle ear, is the smallest bone in the human body, measuring approximately 3 millimeters in length.
Q14. [+2, -0.25]General Knowledge
Who is the author of the book 'My Experiments with Truth'?
A. Jawaharlal Nehru
B. Mahatma Gandhi
C. Rabindranath Tagore
D. Subhas Chandra Bose
Correct Answer: B Mahatma Gandhi wrote the book 'My Experiments with Truth', which is his autobiography.
Q15. [+2, -0.25]Science
What is the process by which the universe became transparent to light?
A. The Big Bang
B. Nuclear Fusion
C. Recombination
D. Dark Matter Formation
Correct Answer: C Recombination is the process by which the universe became transparent to light, occurring about 380,000 years after the Big Bang when electrons and protons combined to form neutral atoms.