50 Science Questions for CDS

1. The power of a lens is measured in – Dioptre
2. ’Anemophily’ pollination is done by – Wind
3. ’Penicillin’ antibiotic is obtained from – Fungi
4. ’Amalgam’ is a term used for an alloy of a metal with –Mercury
5. Sphygmomanometer is used for measuring – Blood pressure
6. Decibel is the unit of measuring – Sound
7. Which bacteria is helpful in making curd from milk – Lactobacillus
8. the largest flightless bird is – Ostrich
9. Metal tea pots have wooden handles because – Insulation from heat
10. Bile is produced in – Liver
11. elements containing same number of electrons are called – Isoelectronic
12. Baby Blue Syndrome is caused due to – Nitrate
13. Richter scale is used for measuring – Seismic waves
14. Non-stick cooking utensils are coated with – Taflon
15. Silver gets corroded due to presence of which compound in air– Hydrogen Sulphide
16. The strongest known natural fibre is – Silk
17. Silkworm feeds on – Mulberry leaves
18. Which metal is used in storage batteries – Lead
19. Which vitamin acts like hormone – vitamin D
20. Swimming pool seems to be shallower due to the phenomenon of – Refraction of light
21. Number of bones in a new-born baby is – 300 Bones
22. Which blood group Is known as universal donor blood group – O blood group
23. Which of the following caused radioactive pollution along Kerala coast – Thorium
24. Which lobe of human brain operates hearing process – Temporal
25. Which of the following disease is caused by Vitamin B3 – Pellagra
26. Which element gives hardness to stainless steel – Carbon
27. Addition of suitable impurities into semiconductor elements is called – Doping
28. ORS is given in – Diarrhoea
29. Which hormone is secreted by Pancreas – Insulin
30. The layer of atmosphere closest to the earth crust is – Troposphere
31. When a sound wave goes from one medium to another, what remains unchanged – Frequency
32. Plants which grow in saline soil are – Halophytes
33. Which organ involved in the process of ingestion in the case of Amoeba – Pseudopodia
34. Bell metal is an alloy of – Tin and Copper
35. CT scan is done using – X rays
36. The sea horse belongs to – fishs
37. Following the sign conventions, the focal length of a concave mirror is – Negative
38. Alum purifies muddy water by the process of – Coagulation
39. In vascular plant, water is conducted by – Xylem
40. Goitre is caused by the deficiency of – Iodine
41. Beaufort scale is used to measure – Wind speed
42. The vertical lines of elements in the modern periodic table are called – Groups
43. The bone of the which organ is the longest in the human body – Thigh
44. Accumulation of which one of the following in the muscles leads to fatigue – Lactic acid
45. ‘Yellow Cake’ a costly compound, contains – Uranium oxide
46. Solar energy is produced by – Fusion reaction
47. Which hormones regulates blood calcium and phosphate?  – Parathyroid hormone
48. Electron was discovered by – J. J. Thomson
49. Blood and lymph are types of – Connective tissue
50. The average life span of Human R.B.C is– 120 days