Question

hii all give me previous Question of class 10th science phy,chem, bio

Answer 1

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☆☆ 1 Marks - Questions ☆☆
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[1.] Which Sodium Compound is used as on antacid in medicine ?

Ans. NaHCO3

[2.] Give the function and Source of Insulin Harmone .

Ans. Source :- Pancreas.
Function :- Metabolism Of Sugar.

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☆☆ 2- Marks Questions ☆☆
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[3.] What do you observed when penta hydrated copper-Sulphate crystals are heated? Give Reaction Also.

Ans.

Blue colour pf copper sulphate changes to white -

CuSO4. 5H2O -------- CuSO4 + 5H2O.

[4.] Name the unit of Inheritence. Write its functions.
Ans. Gene is the unit of inheritence.

Functions :- Gene inherits the traits or character from parent to the offsprings.

[ 5. ] What will be the amount of energy available to the organism of the 2nd tropic level of a food chain, if the energy available at the first tropic level is 10,000 joules.
Ans.

Only 10 percent energy is available from the first tropic level to 2nd tropic level.

10,000 × 10/100 = 1000J ........... ans.

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☆☆ 3 Marks Questions ☆☆
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[6.] Write any three advantages of vegetative propagation.
Ans.

▪ Plants which do not produce viable seeds can be produced this method.
▪ It is cheap easier and more rapid method of propagations.
▪ Plants raised by this method can bear flowers and fruits ear line than these produced from seeds.

[7.] Name the eye defect in which eye lens become cloudy on milky. Name the method for its distant vision and for correcting his near vision he used lens of power + 2.0 D. Calulate the focal length of lenses required to correct these defects.

¤¤ Hint to solve this -----

▪ Sometimes the crystalline lens of people at old age becomes milky or cloudy. This is called cataract.
▪ It is possible to restore the vision through cataract surgery.
▪Focal length of the lens for distant vision
f = 1/P = -1/2 = -0.5m
▪ Focal length of the lens for near vision = 1/2 = + 0.5m.

[8.] Define the following terms :-

▪ Recycling

▪ Suistainable Development.

▪ Chipko Moment or Andolan.

[ You solve it urself]

[9. ] Calculate the energy transferred by a 5A current flowing through a resistor of 2 Ohms for 30 minutes.

¤¤ Hint to solve this question -----

P = I^2 × R

I = 5A And R = 2 ohm

so ,

P = 5^2 × 2 = 50w = 0.5 Kw

t = 30min. = 0.5 hours

Hence , Energy = P × t = 0.025 Kwh....... ans

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☆☆ 5 Marks Questions
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[10. ] Draw the ray diagram in each case to show the position and nature of the image formed when the object is placed : -

▪ At the centre of curvature of a concave mirror.

▪ Between the pole P and focus F of a concave mirror.

▪ In front of a convex Mirror .

▪ At 2F of a convex lens.

▪ At infinity in front of a concave lens.

[ 11. ] A. Draw a neat diagram of an excretory unit of human kidney and lebel the folowing parts :

▪ Bourman's Capsule
▪ Renal Artery
▪ Glomerulus
▪ Collecting Duct

B. Mention any two functions of the kidney.

C. Mention any substances which are selectively reabsorbed as the filterate flows along the tabular part of this unit.

[12. ] A. " Fossils are related to evolution". Justify this statement. Give two ways by which age of fossils can be estimated.

B. List two difference between acquired trait and inherited trait.

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