The diagram shows a bubble at the bottom of a pool. Assuming that the temperature of the pool is constant throughout the water, which of the following describes the change of the pressure and the density of air in the bubble as it rises to the surface?
Five blocks, B1, B2, B3, B4 and B5 of different masses are connected by four identical strings S1, S2, S3 and S4 as shown in the figure. They are pulled by a steadily increasing force F. Which of the following strings is most likely to break?
Three threads P, Q and R of equal weights were taken and immersed in water for one minute. They were then taken out and weighed again. The observations are shown in the given table.
Clothes made from which thread will be most effective when worn in winter and why?
(A) P, because it is bad conductor of heat
(B) Q, because it has lot of air spaces in between its fibres
(C) R, because it has no air spaces in between its fibres
(D) None of these.
why would any body want air spaces in their sweaters?i would think that the answer is C.please tell me the reason for which the answer is B
Read the statements given by three students.
Which out of the following children made wrong statements?
A Naina and Mahi
B Mahi only
C Kartik only
D Mahi and Kartik.
Study the given flow chart carefully and answer the question.
Which group lists the items that can replace R in the flow chart?
P Q R
AIce cube Oxygen Cold Drink
BOxygen Hydrogen Water Vapour
CCoca cola Milk Vinegar
DWater Vapour Oxygen Milk
How can the answer be option B? Gases do not have definite shape or volume. Therefore P cannot be oxygen and Q cannot be Hydrogen. Pls clarify
Following are the characteristics of a type of soil.
1. It has poorvery large water-holding capacity
2. It tends to be very dense
3. has the smallest particle size of any soil type
Which of the following type of crops is suitable to grow in the soil mentioned above?
The first characteristic has two contradictory points: poor and very large water-holding capacity. You need to remove poor as paddy is the answer.
Pranav, a class VII student collected some China rose petals and placed in a beaker. To this he added some warm water, kept it for some time and then he used this coloured water as an indicator. He collected few samples and tested them with China rose indicator. Which of his observations was/were not correct?
Sample Effect on adding China rose indicator
(i) Soap solution Turns green
(ii) Curd No change
(iii) Soft drink Turns dark pink
(iv) Antacid tablet Turns green
A(i) and (ii)
C(ii), (iii) and (iv)
D(i) and (iii)
this question's answer according to the sofolympiad trainer website is option C. the answer given by the website is wrong, isn't it?