21. Which among the following is regarded as the diamagnetic substances?
(A) Silver
(B) Aluminium
(C) Crown glass
(D) Magnesium

22. In fluids, what is the ratio of shearing stress to the strain rate called?
(A) Viscosity constant
(B) Shear Modulus
(C) Coefficient of Tension
(D) Relative Viscosity

23. Which of the following is a process of forming a thick oxide layer of aluminium?
(A) Amalgamating
(B) Cathodising
(C) Calcinating
(D) Anodising

24. The non-metallic oxides are ______ in nature.
(A) Plasma
(B) Neutral
(C) Acidic
(D) Basic

25. Where is the Nadis water harvesting methods found?
(A) Madhya Pradesh
(B) Himachal Pradesh
(C) Kerala
(D) Rajasthan

26. Which of the following types of intermolecular forces are present in CO₂?
(A) Strong Electrostatic Forces
(B) Dipole-Dipole Interaction
(C) Strong Coulombic Forces
(D) Dispersion Forces

27. Car A travels at 36 km/hr while two cars B and C approach car A in opposite directions at 54 km/hr each. When the distance AB = AC = 1 km, car B decides to overtake car A before car C does it. What is the minimum acceleration of car B required to avoid an accident?
(A) 10 m/s²
(B) 1 m/s²
(C) 5 m/s²
(D) 50 m/s²

28. Froth floatation process for the purification of ores is based on the principle of ______.
(A) adsorption
(B) coagulation
(C) absorption
(D) sorption

29. If the number of close-packed spheres is N, then the number of tetrahedral voids is ________.
(A) 4N
(B) 2N
(C) N
(D) 8N

30. What is the collision in which only some of the kinetic energy is lost and deformation is partly relieved called?
(A) Completely inelastic collision
(B) Conserved collision
(C) Inelastic collision
(D) Elastic collision

31. Which national park has the second highest Tiger population in India?
(A) Bandipur National Park
(B) Sanjay Gandhi National Park
(C) Madhav National Park
(D) Tadoba National Park

32. Compounds of alkaline earth metal salts have less solubility than alkali metal salts. This is due to ________.
(A) alkaline earth metals are basic
(B) higher lattice energy for alkaline earth metal salts
(C) higher lattice energy for alkali metals salt
(D) alkaline earth metals are covalent in character

33. Which of the following is an inorganic and abiotic component of an ecosystem?
(A) Primary producers
(B) Animals
(C) Tertiary consumers
(D) Carbon dioxide

34. What is the aim of ‘Paramparagat Krishi Vikas Yojana (PKVY)’ launched by India?
(A) apiculture Promotion and aquaculture
(B) Micro irrigation
(C) Adapting to Genetically modified crops
(D) Organic farming

35. What is the Critical angle of Water with respect to the air that has a refractive index of 1.33?
(A) 28.75
(B) 38.75
(C) 48.75
(D) 68.75

36. During decomposition of silver chloride into silver and chlorine by light, silver chloride turns into _______ colour.
(A) White
(B) Brown
(C) Grey
(D) Black

37. Which one of the following is the consequence of global warming?
(A) Increased oxygen levels
(B) Droughts and floods
(C) increased wildlife
(D) Increased rainfall

38. What is Biochemical Oxygen Demand?
(A) The amount of chemicals in sewage water
(B) The amount of phosphate in sewage water
(C) The amount of nitrates in sewage water
(D) The amount of dissolved oxygen used by micro-organisms in the biological process of metabolising organic matter in water.

39. When did the “London Smog” occur resulting in more than 4000 deaths?
(A) 1975
(B) 1845
(C) 1999
(D) 1952

40. How do we measure the quality of fuel?
(A) Numeric value
(B) Combustion value
(C) Cost value
(D) Calorific value