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11. Consider the graphs of the two linear equations ax + by = c and bx – ay = c, where a, b and c are all greater than zero. […]

10. A large cube is formed from the material obtained by melting three smaller cubes with sides 3, 4 and 5 cm respectively. What is the ratio of the total […]

9. In his 2001 book “What Evolution Is” Ernst Mayr has said that behavior is the pacemaker of evolution. The most appropriate way to refer to this and avoid plagiarism […]

8. You have caught 100 flies, marked them, and released them back in a greenhouse of area 100 m2. Assume the fly population doubles every 4 days; assume no flies […]

7. A goat consumes 2 kg of grass per day, and a cow consumes 4 kg of grass per day. Two pairs of goats and one pair of cattle are […]

6. The Doppler effect causes a change in the perceived frequency of a moving source of sound. Suppose an ambulance is moving with constant speed down a road, and a […]

5. If the average of X, 2X+5, X+6 and 45 is 29, what’s X? a. 15 b. 20 c. 24 d. 32 The average of X, 2X+5, X+6, and 45 […]

4. If the radius and height of a cone are both increased by 100%, then its volume is increased by a. 400% b. 300% c. 200% d. 100% If Radius […]

3. A person throws a ball across a field. When the ball is at the highest point of its trajectory, the direction of its velocity and acceleration are a. parallel […]

2. At night, if a torch is pointed at a cat’s eyes they reflect light back to the source. Why does this phenomenon occur? a. To scare away predators b. […]