CBSE Class 10 Science very short Questions & Answers
31 An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the original and final images seen in the mirror is:
Answer: 2 cm
33 The star appear shifted from their actual position due to the phenomenon of:
Answer: Refraction of light
34 When a beam of white light falls on a glass prism, the colour of light which will deviate least is:
35 A man finds it difficult to read the odometer on the dashboard of the car but is able to clearly read a distant road sign. Which of the following statement is correct about this man?
Answer: The near point of his eyes has receded away.
37 Which of the following represent the correct order of decreasing reactivity?
Answer: Mg > Al > Zn > Fe
38 An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be
39 Which of the following pairs will give displacement reactions?
Answer: AgNO3 solution and copper metal
40 Which among the following is the most abundant metal found in the earth’s crust?