Which of the following statements is/are correct?
I. Larger solid particles can be separated from smaller ones by filtration.
II. Cream can be separated from milk by churning.
III. A mixture of mud and water can be separated by loading, sedimentation and decantation.
IV. Grains can be separated from stalks by threshing.
A I and II only
B II and IV only
C I, II and III only
D II, III and IV only
Study the distance-time graph of a toy car given here and choose the incorrect statement from the following.
A The toy car is fastest during first 10 seconds.
B The toy car is slowest in between 10 and 20 seconds.
C Distance travelled during last 10 seconds is 3 m.
D Total distance covered by the toy car is 10 m.
why the answer cannot be A? how total distance covered by car is 10? it is 13m.
The bumpers and door handles of motor cars, taps etc. are coated with silvery layer of chromium because
(i) It does not easily get corroded.
(ii) It forms a hard layer which does not easily get scratched.
(iii) It tarnishes quickly.
(iv) It is cheap.
Which of the following options is correctly identifies true (T) or false (F)?
it is wrongshould be b
Does a falling body accelerate? Why?
A Yes, because the gravity is a force that causes it to move faster.
B No, because the gravity is a force that causes it to move at constant speed.
C Yes, because the air causes it to accelerate.
D No, because air keeps it moving at constant speed.
gravity acts on the mass of the object. the mass doesn't increase mid air. hence the correct option is c
By which of the following means of transport, can we travel maximum distance in minimum time?
The boiling points of a few gases found in air are given below :
If liquid mixture is fractionally distilled, the order of gases distilling out is
A Krypton, Neon, Nitrogen, Oxygen
B Neon, Nitrogen, Oxygen, Krypton
C Nitrogen, Neon, Oxygen, Krypton
D Oxygen, Neon, Nitrogen, Krypton.
Ans 2: (Master Answer)
The correct answer is B
The gas having lowest boiling point i.e., highly volatile will be distilled out first and the gas having highest boiling point i.e., least volatile will be distilled out at the last. So, the correct order of gases distilling out is neon, nitrogen, oxygen, krypton.
Study the given flow chart and select the INCORRECT option regarding forces X, Y and Z.
AForce 'Y' is caused by the pulling and pushing actions of magnets
BForce 'Z' causes objects to move slowly
CForce 'X' is lesser on smoother surface
DBoth A and B