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Compare nervous and hormonal mechanisms for control and coordination in animals?
What are hormones? Write its characteristics? Name the hormones and their function secreted by ovary and testes?
State how the concentration of auxin stimulates the cell to grow longer on the side of the shoot which is away from light?
(a)Exocrine and endocrine glands
(b)Tropic and nastic movement
What is the effect of auxin on growth of tendrils?
Which is having more resistance?
(i)100 W bulb
The electrical resistivity of few materials is given below in ohm-meter. Arrange the material in descending order of electrical conductivity?
(a) 6.8 X 10-8
(b) 2.60 X 10-8
(c) 1.00 X 10-4
(d) 2.50 X 1012
(e) 4.40 X 10-5
(f) 6.30 X 1018
What are the final products produced after digestion of carbohydrate, proteins and fats?
(a) How electric fuse is connected with electrical devices i.e. in parallel or in series?
(b) How does electric fuse works
(c) Which type of material is commonly used for fuse wire?
(e) Can a 5A fuse be used in wire carrying 15 A current? Why?
(f) An electric oven of 2 kW power rating is operated in a domestic electric circuit that has a current rating of 5A. If the supply voltage is 220V, what result do you expect ? Explain.
Shristi heated Ethanol with a compound A in presence of a few drops of concentrated sulphuric acid and observed a sweet smelling compound B is formed.
When B is treated with sodium hydroxide it gives back Ethanol and a compound C.
(a) Identify A and C
(b) Give one use each of compounds A and B.
(c) Write the chemical reactions involved and name the reactions.
Write the structural formulae of all the isomers of hexane.
How is Magnesium Chloride formed by the transfer of electrons? Why does the solution of Magnesium chloride conduct electricity?
(a) Explain why carbon forms covalent bond? Give two reasons for carbon forming a large number of compounds.
(b) Explain the formation of ammonia molecule.
When F1 plants were cross - pollinated with plants having tt genes, a total of 800 plants were produced. How many of these would be tall, medium height or short plants? Give the genotype of F2 generation.
Define power of a lens. The focal length of a lens is 10 cm. Write the nature of the lens and find its power. If an object is placed at a distance of 20 cm from the optical centre of this lens, according to
the New Cartesian Sign Convention, what will be the sign of magnification in this case ?
If the power of a lens is - 4.0 D, then it means that the lens is a
A. concave lens of focal length -50 m
B. convex lens of focal length +50 cm
C. concave lens of focal length -25 cm
D. convex lens of focal length -25 m
Study the following chemical reaction :
2 Na (s) + 2 H2O (l) 2 NaOH (aq) + H2(g)
The reducing agent in this reaction is :
The process in which loss of water in the form of vapours from the aerial parts of plants takes place is X, which helps in Y. Here X and Y respectively are :
(a) transpiration and photosynthesis.
(b) transpiration and temperature regulation.
(c) translocation and movement of soluble products of photosynthesis in phloem.
(d) translocation and absorption of water and minerals from soil by roots.
Consider the following two statements :
(i) The trait that expresses itself in F1 generation.
(ii) The trait that keeps on passing from one generation to another.
The appropriate terms for the statements (i) and (ii) respectively are :
(a) Recessive trait, Dominant trait
(b) Dominant trait, Recessive trait
(c) Dominant trait, Inherited trait
(d) Recessive trait, Inherited trait
In which of the following groups of organisms, blood flows through the heart only once during one cycle of passage through the body?
A. Rabbit, Parrot, Turtle
B. Frog, crocodile, Pigeon
C. Whale, Labeo, Penguin
D. Shark, dog fish, sting ray
This Class 10 Science Board Exam Sample Paper -2 is prepared keeping in mind the latest syllabus of CBSE . This has been designed in a way to improve the academic performance of the students. If you find mistakes , please do provide the feedback on the mail.
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