Two atoms are said to be isotopes if -
(a) they have the same atomic number but different mass numbers
(b) they have the same number of neutrons but different mass numbers
(c) the sum of the number of protons and neutrons is the same, but the number of protons is different
(d) they have the same number of neutrons but different modes of radioactive decay
Consider the following statements about Periyar E. V. Ramaswamy –
1. He was a politician, social activist and an important figure in the Dravidian movement in South India
2 He championed the cause of caste upliftment, nationalism and the rights of women
3. He was contemporary of the Maharashtran anti-cast reformer, Jotiba Phule
Which of the statements given above is/are correct ?
(a) 1 only (b) 3 only (c) 1 and 3 (d) 1 and 2
Arrange the following events that took place in the first decade of the 20th century in chronological order -
1. Indian National Congress, Bombay Session
2. Establishment of All India Muslim League
3. Partition of Bengal
4. Indian National Congress Surat Session
Select the correct answer using the code given below :
(a) 1-2-3-4 (b) 1-3-2-4 (c) 4-3-2-1 (d) 2-4-1-3
The Nobel Prize in Medicine for the year 2012 has been awarded to John B. Gurdon and Shinya Yamanaka
for the discovery that -
(a) Mature specialized cells can be reprogrammed to become immature cells
(b) stem cells can beprogrammed to develop individual body organs
(c) dendritic cells have a critical role in the development of adaptive immunity
(d) thymus cells have a critical role in the development of innate immunity
Which one among the following statements about a healthy diet is correct ?
(a) Regular eating of high-energy snacks between meals is healthy since it provdes energy and vitamins in
plenty
(b) Fruits and vegetables make a good choice because their energy content is high
(c) A balanced diet must ontain plenty of fat and protein with little carbohydrates and fibre
(d) An optimal quantity of fat, protein, carbohydrate with adequate amount of water and fibre makes a
healthy diet
Which of the following statements about sexual reproduction in flowering plants are correct ?
1. Stament is present in the centre of a flower.
2. Stament produces pollen grains in the ovary
3. The swollen bottom part of carpel is the ovary
4. The fusion of germ cells gives rise to zygote
Select the correct answer using the code given below :
(a) 2, 3 and 4 only (b) 2 and 4 only (c) 1 and 3 only (d) 1, 2, 3 and 4