any one pls give me important questions for science class 10
Answers
learn to balance equations
reactivity series
periodic properties
all diagrams and activities
monohybrid cross
placenta
heart
brain
Explain why a ray of light passing through the centre of curvature of concave minor gets reflected along the same path.
Q. What is the important function of presence of ozone in earth’s atmosphere?
Q. Dark reaction of photosynthesis does not need light. Do plants undergo dark reaction at night? Explain.
Q. How are we able to see distant and nearby objects clearly? Which part of eye helps in changing curvature of lens? Why no image is formed at blind spot?
Q. (a) Which property of carbon leads to formation of large number of compounds? Define it.
(b) What is the functional group in the following molecules?
(i) CH3CH2CH2OH
(ii) CH3COOH
Q. (a) Why magnification is taken negative for real images and positive for virtual images?
(b) Why convex mirror is used in rear view mirrors and not concave mirror?
What are ‘magnetic field lines’? How is the direction of a magnetic field at a point determined ?
(b) Draw two field lines around a bar magnet along its length on its two sides and mark the field directions on them by arrow marks.
(d) Mention the nature of toothpastes. How do they prevent tooth decay?
(i) To which group or period of the periodic table do the listed elements belong?
(ii) What would be the nature of compound formed by a combination of elements B and F?
(iii) Which two of these elements could definitely be metals?
(iv) Which one of the eight elements is most likely to be found in gaseous state at room temperature?
(v) If the number of electrons in the outermost shell of elements C and G are 3 and 7 respectively, write the formula of the compound formed by the combination of C and G.
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