Question : The morphology of chromosomes can be best studied at

Option 1: interphase

Option 2: prophase

Option 3: metaphase

Option 4: zygotene

Question : Why does the water tank appear shallower when viewed from the top?

Option 1: Due to reflection

Option 2: Due to refraction

Option 3: Due to diffraction

Option 4: Due to total internal reflection

Question : If $a^{3}+\frac{1}{a^{3}}=2$, then the value of $\frac{a^{2}+1}{a}$ is ($a$ is a positive number):

Option 1: 1

Option 2: 2

Option 3: 3

Option 4: 4

Question : The rates of work of A and B are in the ratio of 2 : 3. The number of days taken by each of them to finish the work is in the ratio:

Option 1: 2 : 3

Option 2: 4 : 9

Option 3: 3 : 2

Option 4: 9 : 4

Question : What is the difference in the number of years between the summer and winter Olympic events?

Option 1: 1

Option 2: 2

Option 3: 4

Option 4: 3