BCM SCHOOL
BASANT AVENUE DUGRI LDH
SCIENCE- ASSIGNMENT
CLASS-IX
A-MULTIPLE CHOICE QUESTIONS-
1-The velocity of an object is directly proportional to the time elapsed. The object has –
a)uniform speed b)uniform velocity c)uniform acceleration d)variable acceleration
2-A quantity has a value of – 5m/s. It may be the-
a)acceleration of the particle b)speed of the particle c)velocity of the particle d)displacement of the particle
3-Suppose a boy is enjoying a ride on a marry – go –round which is moving with a constant speed of 10 m/s. It implies that the boy is-
a) At rest b) moving with no acceleration c) in accelerated motion d) moving with uniform velocity
4-Which of the following has highest kinetic energy.
a)Particles of ice at zero degree Celsius b) particles of water at zero degree Celsius
c) Particles of water at 100 degree Celsius d)particles of steam at 100 degree Celsius
5-Which one of the following sets of phenomena would increase on raising the temperature?
a)Diffusion , evaporation , compression of gases b) evaporation , compression of gases
c)Evaporation , diffusion , expansion of gases d) evaporation , solubility of gases , diffusion , compression of gases
6-Milk does not provide-
a)Vitamin A and D b) minerals like phosphorus and calcium c)iron d) carbohydrates , proteins and fats
7-Which of the following is a natural insecticide ?
a)Nicotine b) neem c) pyrethrum d) all of the above
8-Which of the following is a micro-nutrient ?
a)phosphorus b)potassium c)nitrogen d) boron
9-A sample of milk was treated with few drops of iodine solution . The milk sample developed blue colour . This shows the presence of which impurity-
a)Water b) starch c) metanil yellow d) none of these
B- ANSWER THE FOLLOWING QUESTIONS-
1-Under what condition distance and the magnitude of displacement equal?
2-Name the physical quantity measured by the area under velocity – time graph .
3-What remains constant in uniform circular motion ?
4-What is dry ice?
5-Name two solid substances which can be changed directly into a gas on heating?
6What is meant by saying that the latent heat of fusion of ice is 334 kilojoules/ kg?
7-Explain why alcohol with a boiling point 351 K evaporates much more quickly than water with a boiling point of 273 K?
8-Can we regard gaseous state of iodine as vapour?
9-A sample of water under study was found to boil at 102 degree Celsius at normal temperature and pressure . Is the water pure? Will this water freeze at zero degree Celsius?
10- Light and sound are not considered to be matter. Why?
11-Why do gases exert pressure on the walls of the container?
12-Which will diffuse at a faster rate –Ammonia or HCl gas . Explain.
13-Name 2 external factors that have favourable effect on egg laying of hens.
14-Explain the term varietal improvement .
15-What does the number ,1:2 mean in intercropping?