Important Questions(1 marks/2 Marks) for Science Class 10 Board

Here is the important question of 1 and 2 Marks for Science Class 10 Board

Question 1) Write name of the compound: CH3-CH2-CHO.

Question 2)  Trilobite, Ammonite are which type of fossils?

Question 3)  Define biological magnification.

Question 4) A person suffering from an eye-defect uses lenses of power 1D to correct the defect. Name the defect, he is suffering from and the nature of lens to be used to correct it.

Question 5)  The odour of Ethanoic acid resembles with:

(i) Tomato Juice

(ii) Kerosene

(iii) Orange Juice

(iv) Vinegar

Question 6)  A burning splinter is introduced near the mouth of four test tubes while adding acetic acid to the chemical present in them. The splinter will get extinguished in the following case.

(i) Sodium chloride+ acetic acid

(ii) Sodium hydroxide+ acetic acid

(iii) Sodium bicarbonate+ acetic acid

(iv) Sodium metal+ acetic acid

Question 7)  During saponification, along with soap, another compound is also formed. The compound is:

(a) Glycol

(b) Glycogen

(c) Glycerol

(d) Glucose

Question 8)  The preparation of soap is also known as:

(a) Etherification

(b) Condensation

(c) Saponification

(d) Oxidation

Question 9)  Soap solution in water is;

(a) Clear salutation

(b) Homogeneous solution

(c) Colloid solution

(d) Suspension

Question 10)  A student obtained a sharp image of a near object on a screen using a conveys lens. For getting better results, the teacher suggested focusing of a distant building instead of the of the object. In which direction should the lens be moved for this purpose?

(a) Away from the screen

(b) Behind the screen

(c) Very far away from the screen

(d) Towards the screen


Question 11)   In the experiment on refraction of light through a glass slab done by four students A, B, C and D, the following observations were made:

(a) The emergent ray moves towards the normal after second refraction through glass slab with i=e

(b) The emergent ray moves away from the normal after second refraction through glass slab with i=e

(c) For any angle of incidence, always l=e

(d) The emergent ray moves away from normal after second refraction through glass slab with i=e

The student who has made the correct observation is:

(a) (A)

(b) (B)

(c) (C)

(d) (D)

Question 12)   After students had observed the slides of binary fission of amoeba, a student was asked by his teacher why this process was called binary fission. Out of the four statements given by different students, which statements is correct:

(a) One parent divides into two daughter cells.

(b) Two daughter cells combine to form a new cell.

(c) One parent and one daughter cel involved in the process.

(d) Two parent cells combine to form daughter cells.

Question 13)   The following events explain budding in years:-

(P) Bud remains attached to the parent body and gives rise to new bud.

(Q) The process may be repeated 3-4 times and a chain of buds is formed

(R) The bud upon maturity gets separated from the parent body and give rise to new bud

(S) Bulb- Like projection is given out from the body of yeast, the nucleus divides into two and one of the daughter nuclei moves in the bud.

Identify the correct sequence of events.

(i) (P), (S), (Q), (R)

(ii)  (S), (R), (P), (Q)

(iii) (S), (P), (Q), (R)

(iv) (R), (S), (P), (Q)

Question 14)  When a ray of light enters from air to the rectangular glass prism the it emerges out of the prism. In this situations the relation between the angle of incidence and angle of emergence is:

(a) Angle of incidence is smaller than the angle of emergence

(b) Angle of incidence is larger than the angle of emergence

(c) Angle of incidence is equal to angle of emergence

(d) None of the above.

Question 15)   A rectangular glass prism has:

(a) two triangular bases and three rectangular lateral surfaces.

(b) Two triangular bases and two rectangular lateral surfaces.

(c) Two triangular bases and four rectangular lateral bases.

(d) Three triangular bases and two rectangular lateral surfaces.


Question 16)   While doing an experiment on convex lens a student found that the image distance of object is equal to object distance and also the heights of object and the image are equal height, in this situation the position of object is at:

(a) Focus of lens

(b) at double the focal length.

(c) Between focus and optical center

(d) between focus and center of curvature.

Question 17)  Wings of a bird, a bat and a housefly are…………to each other

(a) Homologous

(b) vestigial

(c) analogous

(d) Rudimentary

Question 18) The future foot present on embryonic asis in the seed is called:

(a) Cotyledon

(b) Radical

(c) Plumule

(d) Hypocotyl

Question 19) On adding a drop of given solution on a pH paper a student noticed that the pH paper turned orange from this observation it was inferred that the given solution was

a) Acetic acid

b) dil. NaOH

c) dil.HCL

d) dil.NaHO3

Question 20) The chemical nature of soap is

a) Neutral

b) Acidic

c) Basic

d) Amphoteric

Question 21)  The breaking down of oily dirt into tiny droplets by the action of soap is called

a) decomposition

b) displacement

c) dehydration

d) emulsification

Question 22)  Define Power of a lens

Question 23)  Give the electron dot structures of the following molecules.

i) H2S

ii) NH3

iii) CO2

Question 24) State the snell’s law of refraction and express it mathematically

Question 25)  Write the names of these functional groups.

—C= C—, C= C, —C1, —OH

Question 26) Give an example of a flower which contains both stamens and carpels.
Question 27)Mention any one point of difference between Pepsin and Trypsin.
Question 28)An element “X” has mass number 35 and the number of neutrons, is 18. Identify
the group number and period of “X”.

Question 29) An object of height 1.2m is placed before a concave mirror of focal length 20cm so
that a real image is formed at a distance of 60cm from it. Find the position of an object. What will be the height of the image formed?

Question 30 )Why is there a need to harness non-conventional sources of energy? Give two main reasons

Question 31 )Name the rule that is used to find the direction of magnetic field associated with a current carrying conductor.

Question 32 ) What is the function of earth wire in electrical instruments?
Question 33 ) Explain what is short circuiting an electric supply.
Question 34) What is the usual current rating of the fuse wire in the line to feed
(a) Lights and fans? (b) Appliances of 2kW or more power?

Question 35) Why do we use fuse in series with any electrical appliance? Why should a fuse with defined rating not be replaced by one with larger rating?

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