Recent questions tagged class 9

If the velocity-timegraph is a line parallel to time axis, then what be its acceleration

asked Oct 28, 2017 by priyanka.c

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Which of the following actions increases the rate of dissolving?

asked Sep 11, 2017 by meena.p

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Air contains 78 percent nitrogen, 21 percent oxygen, and one percent argon. Which gas is the solvent?

asked Sep 11, 2017 by meena.p

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On increasing temperature of amorphous solid they

asked Sep 11, 2017 by meena.p

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What is the volume of Object X?

asked Sep 11, 2017 by meena.p

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If an object has a density of $3.6 g/mL $ and you put it into water, will it sink or float?

asked Sep 8, 2017 by meena.p

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The balancing of chemical equations is in accordance with:

asked Sep 8, 2017 by meena.p

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The charge/ mass ratio of electron:

asked Sep 8, 2017 by meena.p

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Dry ice on heating produces:

asked Sep 8, 2017 by meena.p

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A student is pouring equal amounts of water, maple syrup, and cooking oil into a glass beaker and looking at how the layers settle. Which property of the liquids is the student most likely comparing?

asked Sep 8, 2017 by meena.p

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Why does an atom have no net electric charge?

asked Sep 8, 2017 by meena.p

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The formula of ethanol is $C_2H_5 – OH$. What will be its molecular mass?

asked Sep 8, 2017 by meena.p

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The atomic number of sodium is 11 and its mass number is 23. It has

asked Sep 8, 2017 by meena.p

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Brass is a solution of molten copper in

asked Sep 8, 2017 by meena.p

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Which of the following compounds when dissolved in water gives coloured solution ?

asked Sep 7, 2017 by meena.p

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The number of electrons presents in $H^+$ is

asked Sep 7, 2017 by meena.p

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The major constituent of air is

asked Sep 7, 2017 by meena.p

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In sugar solution,

asked Sep 7, 2017 by meena.p

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As compared to beryllium, magnesium is

asked Sep 7, 2017 by meena.p

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The gas used for artificial ripening of green fruit is

asked Sep 7, 2017 by meena.p

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The material which can be deformed permanently by heat and pressure is called a

asked Sep 7, 2017 by meena.p

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The isotope deuterium of hydrogen has

asked Sep 7, 2017 by meena.p

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Elements with more than 1 energy level will lose, gain or share electrons until they have _____________ valence electrons.

asked Sep 7, 2017 by meena.p

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Batman and Robin were studying physical and chemical properties of matter. They determined that the mass of a sample was 50 grams. Which sentence best states how mass describes matter?

asked Sep 7, 2017 by meena.p

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In solutions particles are

asked Sep 7, 2017 by meena.p

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Which difference between water and ice results in ice floating on cold water?

asked Sep 7, 2017 by meena.p

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Elements in the same period have the same number of .

asked Sep 7, 2017 by meena.p

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The components of water can be separated by

asked Sep 6, 2017 by meena.p

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$CO_2$ can be easily liquefied and even solidified because

asked Sep 6, 2017 by meena.p

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In the preparation of temporary mount of onion peel which of the following is not used :

asked Sep 6, 2017 by meena.p

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The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is

asked Sep 6, 2017 by meena.p

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The main use of salt in the diet is to

asked Sep 6, 2017 by meena.p

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Atoms which have same number of protons but different number of neutrons are called

asked Sep 6, 2017 by meena.p

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Which one of the followings sets of quantum numbers represents the highest energy level in an atom?

asked Sep 6, 2017 by meena.p

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A student was asked to mix the white of an egg with water and stir well. The student observed that

asked Sep 6, 2017 by meena.p

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What are the number of moles of $CO_2$ which contains 16 g of oxygen?

asked Sep 6, 2017 by meena.p

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$CO_2$ can be easily liquified and even solidified because

asked Sep 6, 2017 by meena.p

1 answer

The isotope used to remove the brain tumours and treatment of cancer is

asked Sep 6, 2017 by meena.p

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If we burn graphite,

asked Sep 6, 2017 by meena.p

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Electrochemical cells convert

asked Sep 6, 2017 by meena.p

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The heat required to raise the temperature of body by 1 K is called

asked Sep 6, 2017 by meena.p

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When NaCl is dissolved in water, negative end of water molecules is attracted towards

asked Sep 6, 2017 by meena.p

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Which of the following refers to the chemical reaction that links monomers to form polymers and that releases water?

asked Sep 6, 2017 by meena.p

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What is the substance that increases the rate of a reaction by lowering the activation energy?

asked Sep 6, 2017 by meena.p

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Which statement best explains why a tree branch floats on water?

asked Sep 6, 2017 by meena.p

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What's the lightest element in the periodic table?

asked Sep 6, 2017 by meena.p

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The mass of $P_4O_{10}$ that will be obtained from the reaction of $1.33\; gram$ of $P_4$ and $5.07$ of oxygen is

asked Sep 6, 2017 by meena.p

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The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock's called

asked Sep 6, 2017 by meena.p

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Molarity of solution which contains $40 \;g$ urea dissolved in $500\;cm^3$ is

asked Sep 6, 2017 by meena.p

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How many electrons, protons and neutrons are present in X+ , if atomic number of X is 19 and its mass number is 39

asked Sep 6, 2017 by meena.p

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