Problem 1
SI unit of time is (1) second (2) minute (3) hour (4) day
Problem 2
Which of the following statements is incorreet? (1) \Lambdall clements are homogencous (2) Compounds made up of a number of elements are hetcrogencous (3) \(\Lambda\) mixture is not always heterogencous (4) \Lambdair is an heterogencous mixture
Problem 3
Which of the following is not an element? (1) Diamond (2) Graphite (3) Silica (4) Ozone
Problem 4
Which one is a physical change? (1) Burning of \(S\) in air (2) Burning of \(C\) in air (3) Conversion of white phosphorous to red phosphorous (4) Corrosion of metals
Problem 5
A pure substance can only be (1) a compound (2) an element (3) an element or a compound (4) a heterogeneous mixture
Problem 6
A pure substance which contains only one type of atoms is called (1) an clement (2) a compound (3) a solid (4) a liquid
Problem 7
The number of significant figures in \(0.0500\) is (1) one (2) three (3) two (4) four
Problem 9
The correctly reported answers of the addition of \(294.406,280.208\) and 24 will be (1) \(598.61\) (2) 599 (3) \(598.6\) (4) \(598.614\)
Problem 10
Two students, \(X\) and \(Y\), reported the mass of the same substance as \(7.0 \mathrm{~g}\) and \(7.00 \mathrm{~g}\), respectively. Which of the following statement is correct? (1) Both are equally accurate (2) \(\mathrm{X}\) is more accurate than \(\mathrm{Y}\) (3) \(\mathrm{Y}\) is more accurate than \(\mathrm{X}\) (4) Both are inaccurate scientifically
Problem 11
The number of significant figures in \(\pi\) is (1) one (2) two (3) three (4) infinite
