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![27. Microphone is used to convert –
A] Electrical energy into sound energy
B] Sound energy into Electrical energy
C] Sound energy into mechanical energy
D] Sound energy into chemical energy
28. The direction of motion of a particle at any instant is given by –
A] Velocity B] Loudness C] frequency D] None of these
29. Isotopes are nuclei which have –
A] Same number of protons
B] Same number of neutrons
C] Unequal electric charge
D] Equal mass.
30. The sky is blue because-
A] there is more blue light in the sunlight
B] of scattering of sunlight by air molecules in the atmosphere
C] of Scattering of sunlight by dust particles in the atmosphere
D] other colours are absorbed by heavenly bodies
31. Particulars which can be added to the nucleus of an atom without changing
its chemical properties are called –
A] Neutron B] Electrons C] Protons
D] Alpha-particulars.
32. The electric lamps each of 100 watts 220 V are connected in series to a
supply of 220 Volts . The power consumed would be –
A] 100 Watts B] 200 Watts C] 25 Watts D] 50 watts
33. Tick out the only wrong statement in the following –
A] Light travels with a sped greater than that of sound
B] Light cannot travel through vacuum
C] Light travels in a straight line
D] Light is a wave motion
E] Light shows diffraction
34. At which temperature do the readings of the Celsius and the Fahrenheit
scales coincide?
A] 0O B] 100O C] -40O D] 80O
35. Marsh gas mainly contains –
A] C2H2 B] H2S2 C] CH4 D] CH3C1](https://image.slidesharecdn.com/cm-130116061555-phpapp02/85/Cm-1-320.jpg)
![36. The nuclear model of the atom was suggested by –
A] Bohr B] Rutherford C] Pauli D] Mendeleev
37. When phosphorus is heated with strong sodium hydroxide solution?
A] Oxidation takes place
B] Hydroxide is formed
C] An inflammable gas evolves
D] No reaction takes place.
38. Which one of the following furnaces can produce the highest temperature
A] Blast furnace
B] Reverberatory furnace
C] Muffle furnace
D] Electric furnace
39. The number of electrons present in the outermost shell of the halogens are
–
A] 4 B] 0 C] 7 D] 2
40. The three elements most usually contained in fertilizers are –
A] Potassium phosphorus and carbon
B] Sodium nitrogen and phosphorus
C] Silica nitrogen and phosphorus
D] Potassium phosphorus and nitrogen
41. Hydrochloric acid reacts with metals to produce –
A] Hydrogen B] Chlorine C] Carbon dioxide, D] Oxygen
42. Iron is extracted from the one –
A] Bauxite B] Cinnabar C] Calamine D] Hematite
43. Which of the following processes results in the formation of a new
chemical compound ?
A] Burning phosphorus in air, B] Heating silver wire to 100OC
C] Dissolving common salt in water D] Melting of Ice
44. Which one of the following alloys does not contain zinc-
A] Brass B] Bronze C] German silver D] Gun metal
45. White Phosphorus is generally kept under –
A] Alcohol B] Water C] Glycerin D] Kerosene oil E] Other
46. Which one of the following compounds gives oxygen on heating ?
A] Mercuric oxide B] Copper oxide C] Zinc oxide](https://image.slidesharecdn.com/cm-130116061555-phpapp02/85/Cm-2-320.jpg)
![D] Aluminum oxide
47. The water present in soil which is absorbed by plants by their root is called
A] Hygroscopic water B] Run-away water
C] Capillary water D] Water Varpour
48. Which of the following gases is regarded as an atmospheric pollutant?
A] O2 B] O3 C] SO2 D] N2
49. Many children in our country suffer from Kwashiorkor: This can be
prevented by giving children food rich in –
A] Carbohydrates B] Fats C] Proteins D] Minerals
50. Virus causes the following disease in man –
A] Influenza B] Malaria, C] Cholera D] Diarrhea
51. Which of the following is odd ?
A] Wheat B] Gram, C] Maize D] Oat
52. Iodine solution gives the following colour with starch ?
A] Red B] Blue C] Green D] Yellow
53. Which of the following is a communicable disease?
A] Leucoderma (white patches of the sky
B] Diabetes mellitus
C] Beri-beri
D] Dysentery](https://image.slidesharecdn.com/cm-130116061555-phpapp02/85/Cm-3-320.jpg)
Uploaded byYogesh Pawar
Cm
The document contains 53 multiple choice questions related to various science topics such as physics, chemistry, and biology. Some of the questions ask about microphones converting sound to electrical energy, the direction of particle motion being indicated by velocity, and isotopes having the same number of protons. Other questions ask about the blue color of the sky being due to scattering of light by air molecules, phosphorus evolving an inflammable gas when heated with sodium hydroxide solution, and iodine solution turning starch blue.
Cm
- 1. 27. Microphone isused to convert – A] Electrical energy into sound energy B] Sound energy into Electrical energy C] Sound energy into mechanical energy D] Sound energy into chemical energy 28. The direction of motion of a particle at any instant is given by – A] Velocity B] Loudness C] frequency D] None of these 29. Isotopes are nuclei which have – A] Same number of protons B] Same number of neutrons C] Unequal electric charge D] Equal mass. 30. The sky is blue because- A] there is more blue light in the sunlight B] of scattering of sunlight by air molecules in the atmosphere C] of Scattering of sunlight by dust particles in the atmosphere D] other colours are absorbed by heavenly bodies 31. Particulars which can be added to the nucleus of an atom without changing its chemical properties are called – A] Neutron B] Electrons C] Protons D] Alpha-particulars. 32. The electric lamps each of 100 watts 220 V are connected in series to a supply of 220 Volts . The power consumed would be – A] 100 Watts B] 200 Watts C] 25 Watts D] 50 watts 33. Tick out the only wrong statement in the following – A] Light travels with a sped greater than that of sound B] Light cannot travel through vacuum C] Light travels in a straight line D] Light is a wave motion E] Light shows diffraction 34. At which temperature do the readings of the Celsius and the Fahrenheit scales coincide? A] 0O B] 100O C] -40O D] 80O 35. Marsh gas mainly contains – A] C2H2 B] H2S2 C] CH4 D] CH3C1
- 2. 36. The nuclearmodel of the atom was suggested by – A] Bohr B] Rutherford C] Pauli D] Mendeleev 37. When phosphorus is heated with strong sodium hydroxide solution? A] Oxidation takes place B] Hydroxide is formed C] An inflammable gas evolves D] No reaction takes place. 38. Which one of the following furnaces can produce the highest temperature A] Blast furnace B] Reverberatory furnace C] Muffle furnace D] Electric furnace 39. The number of electrons present in the outermost shell of the halogens are – A] 4 B] 0 C] 7 D] 2 40. The three elements most usually contained in fertilizers are – A] Potassium phosphorus and carbon B] Sodium nitrogen and phosphorus C] Silica nitrogen and phosphorus D] Potassium phosphorus and nitrogen 41. Hydrochloric acid reacts with metals to produce – A] Hydrogen B] Chlorine C] Carbon dioxide, D] Oxygen 42. Iron is extracted from the one – A] Bauxite B] Cinnabar C] Calamine D] Hematite 43. Which of the following processes results in the formation of a new chemical compound ? A] Burning phosphorus in air, B] Heating silver wire to 100OC C] Dissolving common salt in water D] Melting of Ice 44. Which one of the following alloys does not contain zinc- A] Brass B] Bronze C] German silver D] Gun metal 45. White Phosphorus is generally kept under – A] Alcohol B] Water C] Glycerin D] Kerosene oil E] Other 46. Which one of the following compounds gives oxygen on heating ? A] Mercuric oxide B] Copper oxide C] Zinc oxide
- 3. D] Aluminum oxide 47. The water present in soil which is absorbed by plants by their root is called A] Hygroscopic water B] Run-away water C] Capillary water D] Water Varpour 48. Which of the following gases is regarded as an atmospheric pollutant? A] O2 B] O3 C] SO2 D] N2 49. Many children in our country suffer from Kwashiorkor: This can be prevented by giving children food rich in – A] Carbohydrates B] Fats C] Proteins D] Minerals 50. Virus causes the following disease in man – A] Influenza B] Malaria, C] Cholera D] Diarrhea 51. Which of the following is odd ? A] Wheat B] Gram, C] Maize D] Oat 52. Iodine solution gives the following colour with starch ? A] Red B] Blue C] Green D] Yellow 53. Which of the following is a communicable disease? A] Leucoderma (white patches of the sky B] Diabetes mellitus C] Beri-beri D] Dysentery