1. Pb -------------- .

2. Cu ------------- .

3. Ag -------------- .

4. Hg ------------- .

5. Sn ---------------- .

6. Au -------------- .

1. He won his battle with poverty, to become one of the country’s greatest astrophysicists. The Institute of Nuclear Physics, Kolkata, was established by him in 1947. He died in 1956. _____________

2. He founded the Bose Research Institute in Kolkata in 1915. Totally engrossed in his work, he never pursued fame. Though he was the first to study electric waves yet it was Marconi who got the credit. He invented the crescograph that measured the development of plants and came to the conclusion that plants also feel joy and pain like humans. He died in 1937 _____________

3. Known as the Father of Indian Space Research, he was involved in all projects–be it from the development of uranium for nuclear energy, the development of rockets and missiles and to the installation of nuclear power stations. The ISRO at Thumba, near Thiruvananthapuram, is named after him. He died in 1971. ________________

4. He is remembered for his role in Indian Nuclear Programme. He was the main force behind India’s first nuclear test at Pokhran in 1974. Along with the Tatas, he established the National Institute of Science, Bengaluru. He died in 2004. ________________

5. He was the first Indian scientist to win a Nobel Prize in Physics (in 1930), for his observations on the scattering of light. 28 February, the day he shared his observations with the world, is celebrated as National Science Day in India. He also did some outstanding research work on the veena and the violin. He died in 1970. ________________

1. The virus that causes COVID-19 spreads primarily through respiratory droplets.

2. Antibiotics can prevent and treat COVID-19.

3. I should go to the emergency room for a test to make sure I don’t have COVID-19.

4. I should wear a mask to protect from getting COVID-19.

5. 5G mobile networks DO NOT spread COVID-19.

6. Wearing medical masks DOES NOT cause oxygen deficiency.

7. Nephritis is the inflammation of the kidneys.

8. The Ebola disease is named after a river in the Democratic Republic of the Congo.

9. Tonsillitis is an infectious viral disease that affects the central nervous system and can cause temporary or permanent paralysis.

10. Mumps is an infectious viral disease causing swelling of the parotid salivary glands in the face.

1. ______________________ is the biggest of all the planets of the solar system.

2. ______________________ has water and atmosphere and is perhaps the only planet which has conditions suitable for life. It has one moon.

3. ______________________ is the hottest planet. It is named after the Roman goddess of love and beauty.

4. ______________________ is closest to the sun. This planet is named after the messenger of the Roman god.

5. ______________________ was the first planet which was discovered with a telescope.

6. ______________________ is a red planet, named after the Roman god of war.

7. ____________________ is named after the Roman god of the sea. It has eight satellites.

8. The Uranus rotates in ______________________ direction.

9. Our solar system has a diameter of ______________________ km.

10. ______________________ is named after the Roman god of farming. It is the second largest planet after Jupiter.

11. It is believed that our solar system was formed ______________ years ago.

12. _______________ now is not regarded as a plant any more. It is now called a dwarf planet. It was once regarded as the planet farthest from the sun.

1. A deficiency of this leads to a disease called goitre. ................ .

2. A white-coloured element used in developing of photographic negatives. .................. .

3. Used for giving a white polish to costume jewellery. .............. .

4. Turns to liquid at room temperature, also known as quicksilver. ................... .

5. An orange-pink element used to make electrical wires and cables. ....................... .

6. Used in the process of galvanisation, while electroplating an iron object. .................. .