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Class 10 science

Home/ Class 10/Class 10 science/Page 39

A concave mirror of focal length 20 cm forms an image having twice the size of object. For the virtual position of object, the position of object will be at

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Rohit QNA Rohit QNA
(a) 25 cm (b) 40 cm (c) 10 cm (d) At infinity
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Class 10 science 3 years 1 Answer 24 views Enlightened 0

An object at a distance of 30 cm from a concave mirror gets its image at the same point. The focal length of the mirror is

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Rohit QNA Rohit QNA
(a) – 30 cm (b) 30 cm (c) – 15 cm (d) +15 cm
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Class 10 science 3 years 1 Answer 12 views Enlightened 0

which of the following mirror is used by a dentist to examine a small cavity?

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Rohit QNA Rohit QNA
(a) Convex mirror (b) Plane mirror (c) Concave mirror (d) Combination of convex and concave mirror
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Class 10 science 3 years 1 Answer 3 views Enlightened 0

Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount collected in the other? Name this gas.

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Class 10 science 3 years 1 Answer 96 views Tech Professional 1

A solution of a substance ‘X’ is used for white washing.

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ashishqna ashishqna
(i) Name the substance ‘X’ and write its formula.(ii) Write the reaction of the substance ‘X’ named in (i) above with water.
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Class 10 science 3 years 1 Answer 46 views Tech Professional 0

Write a balanced chemical equation with state symbols for the following reactions.

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ashishqna ashishqna
(ii) Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water.
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Class 10 science 3 years 1 Answer 19 views Tech Professional 0

Write a balanced chemical equation with state symbols for the following reactions.

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ashishqna ashishqna
(i) Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride.
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Class 10 science 3 years 1 Answer 11 views Tech Professional 0

Write the balanced equation for the following chemical reactions.

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ashishqna ashishqna
(i) Hydrogen + Chlorine → Hydrogen chloride(ii) Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride(iii) Sodium + Water → Sodium hydroxide + Hydrogen
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Why should a magnesium ribbon be cleaned before it is burnt in air?

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