Q1. Fill in the blanks: -
a. Atmospheric pressure ____________ as altitude increases.
b. Plant hormones called ______________ regulate germination and growth in plants.
c. In oscillation, the maximum displacement of a body from the mean position is called ________________.
d. _____________ is called the master gland.
e. Hydra reproduces by the process of _____________.
Q2. Choose the correct answer for the following: -
a. Instrument used to measure liquid pressure
i) Manometer ii) Barometer iii) Thermometer iv) ammeter
b. An electrolyte is
i) a metal ii) a metalloid iii) a liquid that conducts current iv) non-metal
c. Fertilization is
i) production of sperms ii) production of eggs iii) fusion of sperms and eggs iv) none of these
d. Sound propagates faster in
i) gas ii) solid iii) liquid iv) vacuum
e. The hormone secreted at the time of emergency
i) oestrogen ii) testosterone iii) adrenaline iv) insulin
Q3. State whether True or False: -
a. Duck-billed platypus is an oviparous animal.
b. Fluid pressure depends on the area of the fluid column.
c. Electric charges produced by rubbing are called static charges.
d. Cones of our eye are responsible for the colour vision.
e. The number of oscillations per second of is called frequency.
Q4. Name the following: -
a. Electrode connected to the negative terminal of a battery.
b. The common name for liquids and gases
c. Baby during the first eight weeks after fertilization.
d. Chemical substances that act like messengers.
e. Principle of kaleidoscope.
Q5. State any two characteristics of images formed by a plane mirror.
Q6. What is the function of the fluid filled in the inner ear or cochlea?
Q7. Give one difference between an atom and an ion.
Q8. The Newton’s disc appears white when it is rotated. Identify the phenomenon responsible for this.
Q9. Name any two factors on which the speed of sound depends.
Q10. Where does the external fertilization of frog take place? Name another animal that fertilize in the similar way.
Q11. The edges of cutting instruments have to be sharp. Why?
Q12. Why do charged bodies lose their charge if we touch it?
Q13. Acne is common during adolescence. Why?
Q14. A force of 500 N acts on an area of 25 cm². Calculate the pressure exerted.(Write all statements)
Q15. State the laws of reflection.
Q16. What decides the pitch of a sound? How can we change the pitch of a drum?
Q17. (a) What should be the cathode and anode when a copper spoon is electroplated with silver?
(b) After the electroplating of the spoon with silver, it was found that the silver rod has become thin. Why?
Q18. Give reason i) Dams are thicker at the base than at the top ii) Battle tanks have chains instead of wheels.
Q19. Give the function of a) insulin and b) thyroxine.
Q20. What is metamorphosis? Name the four main stages in the life cycle of a butterfly.
Q21. Give a safety measure during a thunderstorm when you are (a) on an open field (b) in a vehicle.
Q22. What is adolescence? Give any two physical changes that take place in boys during this time
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