Q1. A pure substance can only be-
(a) compound
(b) an element
(c) an element or a compound
(d) a heterogeneous mixture
Q2. The most abundant metal in earth crust is-
(a) iron
(b) magnesium
(c) calcium
(d) aluminum
Q3. An alloy is-
(a) a compound
(b) an allotropic form
(c) an isomer
(d) a mixture
Q4. Sodium carbonate crystals lose water molecules. This property is called-
(a) hygroscopy
(b) deliquescence
(c) efflorescence
(d) none of these
Q5. 1 amu is equal to-
(a) 1.00758 g
(b) 0.000549 g
(c) 1.66 × g
(d) g
Q6. Antimony is-
(a) metal
(b) non metal
(c) metalloid
(d) none of these
Q7. Which one of the following is not a mixture compound –
(a) air
(b) milk
(c) mercury
(d) cement
Q8. The M.K.S system was first introduced by-
(a) Archimedes
(b) Einstein
(c) Newton
(d) Giorgi
Q9. Bar is unit of-
(a) pressure
(b) force
(c) energy
(d) frequency
Q10. ‘Misch metal’ is widely used in manufacture of which of the following-
(a) material of car brake
(b) smoke detectors
(c) cigarette lighters
(d) emergency lights
Answers
S1. Ans.(c)
S2. Ans.(d)
S3. Ans.(d)
S4. Ans.(c)
S5. Ans.(c)
S6. Ans.(c)
S7. Ans.(c)
S8. Ans.(d)
S9. Ans.(a)
S10. Ans.(c)
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