Question: A mixture of sand and iodine can be separated by
- a) sublimation
- b) crystallisation
- c) distillation
- d) fractionation
Answer: sublimation
Question: Difference in density is the basis of
- a) gravity separation
- b) molecular sieving
- c) ultrafiltration
- d) molecular attraction
Answer: gravity separation
Question: Which of the following is an example of a heterogeneous substance?
- a) Candle
- b) Pieces of copper
- c) Table salt
- d) Bottled water
Answer: Candle
Question: Which of the following substances cannot be separated in
- a) Solid glucose
- b) Salt and sugar
- c) Sugar and water solution
- d) None of these
Answer: Solid glucose
Question: Which of the following statements about a compound is incorrect?
- a) A compound retains the physical properties of its constituent elements.
- b) The ratio of atoms of different elements in a compound is fixed
- c) A compound cannot be separated into its constituent elements by physical methods of separation.
- d) A molecule of a compound has atoms of different elements.
Answer: A compound retains the physical properties of its constituent elements.
Question: A mixture contains two or more substances in ________
which are called its ________.
- a) any ratio, components
- b) fixed ratio, elements
- c) any ratio, elements
- d) fixed ratio, compounds
Answer: any ratio, components
Question: Which one of these is not a pure compound?
- a) Sucrose solution
- b) H2O2
- c) O3
- d) H2O
Answer: Sucrose solution
Question: One fermi is
- a) 10–13 cm
- b) 10–12 cm
- c) 10–15 cm
- d) 10–10 cm
Answer: 10–13 cm
Question: The prefix 1018 is
- a) exa
- b) giga
- c) kilo
- d) nano
Answer: exa
Question: The prefix zepto stands for (in m)
- a) 10–21
- b) 10–12
- c) 109
- d) 10–15
Answer: 10–21
More Questions...............................
Question: Which has highest weight ?
- a) 1 m3 of water
- b) 10 litre of Hg
- c) A normal adult man
- d) All have same weight
Answer: 1 m3 of water
Question: Which one of the following set of units represents the smallest and largest amount of energy respectively?
- a) eV and L-atm
- b) erg and cal
- c) J and erg
- d) cal and eV
Answer: eV and L-atm
Question: A measured temperature on Fahrenheit scale is 200 °F. What will this reading be on Celsius scale ?
- a) 93.3 °C
- b) 40° C
- c) 94° C
- d) 30° C
Answer: 93.3 °C
Question: Which of the following is not a SI unit?
- a) litre
- b) candela
- c) metre
- d) mole
Answer: litre
Question: The prefix 10–24 is
- a) yocto
- b) yotta
- c) zeta
- d) zepto
Answer: yocto
Question: Many countries use Fahrenheit scale for expressing temperature of atmosphere. If temperature in any such country is measured 41°F then what is its value in celcius scale and would you expect hot or cold atmosphere in that country?
- a) 5°C, cold
- b) 15°C, cold
- c) 25°C, normal
- d) 41°C, hot
Answer: 5°C, cold
Question: A sample was weighted using two different balances. The results were
(i) 3.929 g (ii) 4.0 g
How would the weight of the sample be reported?
- a) 3.9 g
- b) 3.93 g
- c) 3g
- d) 3.929 g
Answer: 3.9 g
Question: 0.00016 can be written as ____A ____ in scientific notaiton. Here, A refers to
- a) 1.6 × 10–4
- b) 24.50 × 10–9
- c) 24.50 × 10–7
- d) 2.450 × 10–8
Answer: 1.6 × 10–4
Question: If the true value for an experimental result is 6.23 and the results reported by three students X, Y and Z are :
X : 6.18 and 6.28
Y : 6.20 and 6.023
Z : 6.22 and 6.24
Which of the following option is correct :
- a) Both X & Y neither precise nor accurate, Z both precise and accurate.
- b) Both X & Z precise & accurate, Y not precise
- c) X precise and accurate, Y not precise, Z precise
- d) X precise, Y accurate, Z precise and accurate
Answer: Both X & Y neither precise nor accurate, Z both precise and accurate.
Question: The number of significant figures for the three numbers 161 cm, 0.161 cm, 0.0161 cm are
- a) 3,3 and 3 respectively
- b) 3,4 and 4 respectively
- c) 3,4 and 5 respectively
- d) 3,3 and 4 respectively
Answer: 3,3 and 3 respectively