CBSE Class 10 Science very short Questions & Answers

CBSE Class 10 Science Multiple Choice Questions(MCQs) & Answers CBSE Class 10 Science QUESTIONS

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:
A 2 cm
B 22 cm
C 4 cm
D 10 cm

Answer: 2 cm
32 Blue colour of the sky is due to the phenomenon of:
A Scattering of light
B Dispersion of light
C Reflection of light
D Refraction of light

Answer: Scattering of light
33 The star appear shifted from their actual position due to the phenomenon of:
A Reflection of light
B Refraction of light
C Scattering of light
D Diffraction of light

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:
A Red
B Blue
C Violet
D Green

Answer: Red
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?
A The far point of his eyes has come closer to him.
B The near point of his eyes has receded away.
C The near point of his eyes has come closer to him.
D The far point of his eyes has receded away.

Answer: The near point of his eyes has receded away.
36 In the given reaction, Al2O3 + NaOH → ……X…… + H2O What is element X?
A NaAlO2
B NaAl2O3
C Na3Al
D Na2O3

Answer: NaAlO2
37 Which of the following represent the correct order of decreasing reactivity?
A Mg > Al > Zn > Fe
B Mg > Fe > Zn > Al
C Mg > Zn > Al > Fe
D Al > Zn > Fe > Mg

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
A Fe
B Ca
C C
D None of these

Answer: Ca
39 Which of the following pairs will give displacement reactions?
A AgNO3 solution and copper metal
B FeSO4 solution and silver metal
C NaCl solution and copper metal
D MgCl2 solution and aluminium metal

Answer: AgNO3 solution and copper metal
40 Which among the following is the most abundant metal found in the earth’s crust?
A Aluminium
B Iron
C Magnesium
D Oxygen

Answer: Aluminium

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