501: The Indian national movement became organised for the first time in
(a) 1885
(b) 1857
(c) 1905-06
(d) 1916-17
502: In an office, the number of persons who take tea is twice the number of persons who take only coffee. The number of persons who take coffee is twice the number of persons who take coffee is twice the number of persons who take only tea.
Consider the following statements :
1. The sum of the number of persons who take either tea or coffee or both is four times the number of persons who take both coffee and tea.
2. The sum of the number of persons who take only coffee and those who take only tea is twice the number of persons who take both and coffee. Which of the statements given above is/ are correct?
503: What is the role of ultraviolet (UV) radiation in the water purification systems?
1. It inactivates/kills the harmful micro-organism in water.
2. It removes all the undesirable odours from the water.
3. It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
504: Chlorophyll is a naturally occurring chelate compound in which central metal is
(a) Magnesium
(b) Copper
(c) Calcium
(d) Iron
505: Assertion (A): Wind patterns are clockwise in the northern hemisphere and anti-clockwise in the southern hemisphere.
Reason (R):The direction of wind patterns in the northern and the southern hemisphere are governed by Coriolis effect.
(a) Both A and R are individually true and R is the correct explanation of A.
(b) Both A and R are individually true but R is not the correct explanation of A
(c) A is true but R is false.
(d) A is false but R is true.