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23rd July 2014, 09:59 AM
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Join Date: Apr 2013
Re: Class 10th CBSE question papers

Here I am giving you Class 10th Central Board of Secondary Education (CBSE) question papers.

The correct order which describes the true solution, colloidal solution and suspension in
the order of their increasing stability is :
(a) Suspension < colloidal solution < true solution
(b) Colloidal solution < true solution < suspension
(c) True solution < colloidal solution < suspension
(d) Colloidal solution < suspension < true solution

To prepare iron sulphide, by heating a mixture of iron filings and sulphur powder, we
should use a
(a) test tube.
(b) watch glass.
(c) china dish.
(d) petri dish.

When a mixture of common salt and ammonium chloride is heated, it is observed that
(a) Solid common salt gets deposited on the cooler parts of the funnel while solid
ammonium chloride remains in the china dish.
(b) Mixture of common salt and ammonium chloride turns into greenish crystals when
allowed to cool.
(c) Ammonium chloride gets deposited on the cooler parts of the funnel and solid
common salt remains in the china dish.
(d) droplets containing both common salt and ammonium chloride appear on the
upper part of the funnel while some molten mixture of common salt and ammonium
chloride remains in the china dish.

Copper sulphate solution is added to a test tube containing a clean iron nail. The correct
description regarding the deposition of copper on the iron nail would be that it starts
depositing
(a) at the tip of the nail
(b) from the head of the nail
(c) in the middle of the nail
(d) anywhere on the nail

While determining the density of a copper piece using a spring balance and a measuring
cylinder, Seema carried out the following procedure :
i. noted the water level in the measuring cylinder without the copper piece
ii. immersed the copper piece in the water
iii. noted the water level in the measuring cylinder with the copper piece inside it.
iv. removed the copper piece from the water and immediately weighed it using a
spring balance.
The wrong step in the procedure is
(a) step (i)
(b) step (ii)
(c) step (iii)
(d) step (iv)

A laboratory had the following apparatus available in it :
(A) Two thin hollow wooden tubes
(B) An intense & broad source of sound
(C) An Intense, pointed source of sound
(D) A sharp pointed detector to detect the sound
(E) A well polished metal sheet
(F) A white painted thermocol sheet
A student can do his experiment to verify the laws of reflection of sound successfully by
choosing the appartus labelled as
(a) A, C, D, E
(b) A, C, E
(c) A, B, D, E
(d) A, C & D

While doing the experiment on measuring the velocity of a pulse through a stretched
string, a student had to choose between a
(i) thick silk string and a thick cotton string
(ii) stop clock and a table clock.
The combination choice that he should prefer is
(a) silk string and the table clock
(b) silk string and the stop clock
(c) cotton string and the table clock
(d) cotton string and the stop clock

On adding water to a sample of arhar dal (tuvar dal) a student found that the water
became yellow in colour. He took a sample of this yellow water and added a few drops
of dilute HCl. The sample became pink. This confirms that the adulterant added to the dal
was
(a) Turmeric
(b) metanil yellow
(c) potassium dichromate
(d) yellow dye

Given below are four operations for preparing a temporary mount of human cheek
cells :
(i) taking scraping from inner side of the cheek and spreading it on a clean slide
(ii) putting a drop of gycerine on the material
(iii) adding two or three drops of methylene blue
(iv) rinsing the mouth with fresh water and disinfectant solution.
The correct sequence of these operations is
(a) i-ii-iii-iv
(b) iv-i-iii-ii
(c) iv-i-ii-iii
(d) i-iii-ii-iv

The specimens of a bird and a fish were given to students to identify the feature / features
that places them in the same phylum. The correct identifying feature /features would be
(a) pointed heads.
(b) bulky thorax.
(c) presence of scales.
(d) post anal tails.







For more detailed papers here I am attaching pdf files of Class 10th Central Board of Secondary Education (CBSE) question papers. You can download.


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