CBSE Class 10 Science Competitive Exams Questions and Answers

CBSE Class 10 Science Competitive Exams Questions and Answers CBSE Class 10 Science QUESTIONS

CBSE Class 10 Science Competitive Exams Questions and Answers

81 Which of the following forms the basis of the modern periodic table?
A Atomic mass
B Number of nucleons
C Atomic number
D All of these

Answer: Atomic number
82 How many periods and groups are present in the periodic table?
A 8 periods and 8 groups
B 8 periods and 7 groups
C 7 periods and 7 groups
D 7 periods and 18 groups

Answer: 7 periods and 18 groups
83 Arteries and veins are connected by a network of extremely narrow tubes called:
A Sieve tubes
B Capillaries
C Vena cava
D Valves

Answer: Capillaries
84 Which among the following is necessary to carry out the blood coagulation in a cut or wound?
A Platelets
B Red blood cells
C White Blood Cells
D Blood plasma

Answer: Platelets
85 an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed at a distance of 19 cm from the lens, the image formed is slightly larger than the object. The approximate focal length of the lens is:
A 10 cm
B 5 cm
C 20 cm
D 18 cm

Answer: 10 cm
86 A lens of focal length 12 cm forms an erect image, three times the size of the object. The distance between the object and image is:
A 8 cm
B 36 cm
C 16 cm
D 24 cm

Answer: 8 cm
87 A ray of light is travelling in a direction perpendicular to the boundary of a parallel glass slab. The ray of light:
A Is reflected along the same path
B Does not get refracted
C Is refracted towards the normal
D Is refracted away from the normal

Answer: Does not get refracted
88 Two big mirrors A and B are fitted side by side on a wall. A man is standing at such a distance from the wall that he can see the erect image of his face in both the mirrors. When the man starts walking towards the mirrors, he finds that the size of his face in mirror A goes on increasing but that in mirror B remains the same:
A Mirror A is concave and mirror B is plane
B Mirror A is convex and mirror B is concave
C Mirror A is concave and mirror B is convex
D Mirror A is plane and mirror B is concave

Answer: Mirror A is concave and mirror B is plane
89 A concave mirror produces a magnification of +4. The object is placed:
A Beyond the centre of curvature
B Between focus and pole
C At the focus
D Between focus and centre of curvature

Answer: Between focus and pole
90 A got his eye tested. The optician’s prescription for the spectacles was: Left eye: −3 D Right eye: −3.50 D The person is having a defect of vision called:
A Presbyopia
B Myopia
C Astigmatism
D Hypermetropia

Answer: Myopia

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