Tiwari Academy Discussion

Rajshree Chatterjee

Asked: December 21, 2023In: Class 10 Science

Name the phenomenon that governs the following: – i) Green beetles living in green bushes are not eaten by the crows. ii) Number of blue beetles in green bushes increases, only because the red beetles living there were trampled by a herd of elephants. iii) No ‘medium height plants’ are obtained in F1 generation, upon crossing pure tall and dwarf pea plants. iv) Tails of mice were surgically removed for several generations; still mice had tails in the following generations. v) A migrant beetle reproduces with the local population; as a result genes of migrant beetle enter the new population.

CBSE Class 10 Science Pre Board Sample Question Paper 2023-24

Rajshree Chatterjee

Asked: December 21, 2023In: Class 10 Science

When we observed under high power of the microscope, ‘chain of buds’ is visible in the microscopic view. (i) In which organism can it be observed? (ii) Explain the process.

CBSE Class 10 Science Sample Question Paper 2023-2024

Kiara Singh

Asked: December 21, 2023In: Class 10 Science

Why do more and more people prefer to use condoms? What is the principle behind use of condoms?

NCERT, CBSE Class 10 Science Sample Question Paper new 2023-2024 with Solutions

Kiara Singh

Asked: December 21, 2023In: Class 10 Science

A compound A (C2H4O2) reacts with Na metal to form a compound ‘B’ and evolves a gas which burns with a pop sound. Compound ‘A’ on treatment with an alcohol ‘C’ in presence of an acid forms a sweet-smelling compound ‘D’ (C4H8O2). On addition of NaOH to ‘D’ gives back B and C. Identify A, B, C and D write the reactions involved.

CBSE class 10 science sample question paper SQP 2023-2024

Srushti

Asked: December 20, 2023In: Class 10 Science

Sunita takes a mirror which is depressed at the centre and mounts it on a mirror stand. An erect and enlarged image of her face is formed. She places the mirror on a stand along a meter scale at 15 cm mark. In front of this mirror, she mounts a white screen and moves it back and forth along the meter scale till a sharp, well-defined inverted image of a distant tree is formed on the screen at 35 cm mark. (i) Name the mirror and find its focal length. (ii) Why does Sunita get sharp image of the distant building at 35 cm mark.

CBSE Class 10 Science Sample Question Paper 2023-2024 with Solutions free download

Kiara Singh

Asked: December 19, 2023In: Class 10 Science

A variegated leaf with green and yellow patches in used for an experiment to prove that chlorophyll is required for photosynthesis. Before the experiment the green portions (A), and the pale-yellow portions (B), are observed. Now, answer that – what will be the colour of ‘A’ just before and after the starch test? Write also the equation of the process of photosynthesis and mark, as well as validate from which molecule the by-product is obtained.

Rationalised syllabus 2023-2024 CBSE Class 10 sample question paper

Subham Kumar

Asked: December 19, 2023In: Class 10 Science

Noopur needs a lens of power -4.5D for correction of her vision. a) What kind of defect in vision is she suffering from? b) What is the focal length and nature of the corrective lens? c) Draw ray diagrams showing the (a) defected eye and (b) correction for this defect. d) What are the causes of this defect?

CBSE class 10 science sample question paper 2023-2024

Subham Kumar

Asked: December 19, 2023In: Class 10 Science

A compound which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water. Identify the compound and write its chemical formula. Write the chemical equation for its preparation. Mention any one use of the compound.

NCERT, CBSE Class 10 Science sample question paper 2023-2024

Mayur Arya

Asked: December 16, 2023In: Class 10 Science

A student has to project a three times magnified image of a candle flame on a wall. Name the type of the lens (converging/ diverging) required for the purpose. It the candle flame is at a distance of 6 m from the wall, find the focal length of the lens.

CBSE class 10 science sample question paper pdf free download 2023-2024

Subham Kumar

Asked: December 16, 2023In: Class 10 Science

What are isomers? “Isomers of the first three members of alkane series are not possible”. Give reason to justify this statement and draw structures of two isomers of butane, C4 H10.

NCERT CBSE class 10 science sample question paper 2023-2024

When we observed under high power of the microscope, ‘chain of buds’ is visible in the microscopic view. (i) In which organism can it be observed? (ii) Explain the process.

Why do more and more people prefer to use condoms? What is the principle behind use of condoms?

A compound which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water. Identify the compound and write its chemical formula. Write the chemical equation for its preparation. Mention any one use of the compound.

A student has to project a three times magnified image of a candle flame on a wall. Name the type of the lens (converging/ diverging) required for the purpose. It the candle flame is at a distance of 6 m from the wall, find the focal length of the lens.

What are isomers? “Isomers of the first three members of alkane series are not possible”. Give reason to justify this statement and draw structures of two isomers of butane, C4 H10.

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