1. What physical state of matter it has a define shape? (A) Liquids and gases (B) Liquid (C) air (D) solid
2. Which of the following substance acts as a pure substance? (A) Sodium chloride (B) Cold drink (C) Aerosol (D) Clay
3. Which of the following pair is not true? (A) Calcium-Ca (B) Silver-Ag (C) Gold-Au (D) Copper-Co
4. Most of the mass of an atom is contained in ________. (A) Protons (B) Electron (C) Center (D) Neutrons
5. Which of the following mixtures is not a solution? (A) Sea water (B) air (C) Soda water (D) Coal
6. Which tissue is an involuntary muscle with linear stripes? (A) Skeletal muscle (B) Smooth muscle (C) Heart muscle (D) Fiber component muscle
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Answers
Answer:
(1) = (d) Solid ✅
(2) = (a) Sodium chloride ✅
(3) = (b) Silver-Ag ✅
(4) = (a) Protons ✅
(5) = (b) Air ✅
(6) = (c) Heart muscle ✅
Explanation:
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Answer:
1. d) Solid
2. a) Sodium chloride
3. d) Copper-Co
4. c) Centre
5. d) Coal
6. c) Heart muscles
Explanation:
1. Solid is the physical state of matter that has a definite shape.
2. Out of all the options, Sodium chloride acts as a pure substance.
3. The correct symbol for copper is Cu.
4. The atom has most of its mass concentrated in the centre of the nucleus. The nucleus has protons and neutrons contained in it.
5. Coal is a heterogeneous mixture, whereas seawater, air and soda water are a homogeneous mixture of two or more substances.
6. Cardiac muscle/Heart muscle is found in the heart and is involuntary in nature. These have striations (linear stripes) and are responsible for the pumping of blood.