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20. Fraunhofer lines are dark lines in the solar spectrum. They arise because a. the sun consists mainly of hydrogen and helium, which do not emit a continuous spectrum. b. […]

19. The specific gravity of an alloy made of two metals in equal volumes is 4. But when the alloy is made up of the same two metals in equal […]

18. Shape A can be mapped onto shape B by [Figure needed] a. translation and rotation b. rotation and scale transformation c. reflection and scale transformation d. reflection, scale transformation […]

17. The volume of a liquid is measured to be 100 ml with an uncertainty of ± 3 ml, and its mass is measured to be 100 g with an […]

16. Four charges of magnitude 𝑞 are put on a square of side length 𝑎. If three of the charges are positive and one is negative, what is the magnitude […]

15. A train runs at a speed of 90 kmph from P to Q and 110 kmph from Q to P? What is the average speed of the train during […]

14.Based on the phylogenetic tree provided below, which of the following statements is true? a. F is more closely related to A than to G b. E and D share […]

13. There are two digital clocks in a room. One of them loses 5 minutes each hour, while the other gains 5 minutes each hour. Assuming the two clocks were […]

12. Imagine that you are looking at one cancer cell under the microscope, and trying to estimate the probability that it will die due to a chemotherapy. You know that […]

11. In statistics, a distribution is considered symmetric if the mean, median, and mode are equal. If they differ, the distribution is termed asymmetric. If the right tail is longer, […]