Question

Class IX.
Physical science
1.Choose the correct answer:
(1) (LT) is the dimension of
(a) velocity. Not acceleration. (c) force. (d) pressure
(ii) Definition of force can be obtained by Newton's
(a)first law of motion (a) second law of motion (c) third law of motion (d) first and seco
motion
(iii) A man moving round a square field each side of which is 50 m returns to the startin
displacement is
(a)0 m (b) 50 m (c) 100 m (d) 200 m
(iv) When a body weighs more than that of the liquid displaced by it, the body
(a)Floats completely immersed anywhere within the liquid (b) floats partly immersed (
floats on the middle of the liquid
(v) Unit of strain is
(a)N/m² (b) newton (c) Kg (d) none
(vi) Electron was discovered by
(a)Rutherford (b) Thompson (c) Bohr (d) Chadwick
(vii) Which of the following is the Avogadro's number?
(a)6.022x1022 (b) 6.023x1024 (c) 6.022x1023 (d) 6.022x1021
2. Answer the following questions:
(1) Name a physical quantity which has no unit.
(ii) Whose unit is light year?
(ii) Write whether speed and distance are vector or scalar quantities.
(iv) Write the relationship between force and acceleration.
(v) Write the SI unit of momentum.
(vi) Thrust =
_X area. (fill in the blank].
(vii) What kind of weather can be expected by a steady rise in barometer reading?
(viii) Give an example of ductile material.
(ix) Name an atom with no neutron.
(x) What is the volume of 44g of carbon dioxide at STP?​

Answer 1

Answer:

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