Rahul gets an assignment to make a list of fabrics made of different fibres. He takes pieces of fabric X and Y and burns them to identify the fibre. Fibre X burns with smell of charred meat and fibre Y burns with smell of burning hair. Identify the fabrics X and Y.
ans is B
Digit at the tens place in the number that comes as a difference between 5 hundreds 6 tens 13 ones and 7 hundreds 2 tens 15 ones is _________.
can anyone explain this solution
Two satellites S1 and S2 revolve around a planet in coplanar circular orbits in the same sense. Their periods of revolution are 1 h and 8 h respectively. The radius of the orbit of S1 is 104 km. When S2 is closest to S1, then the speed of S2 relative to S1 will be
Aπ × 104 km h-1
B2π × 104 km h-1
C1 × 104 km h-1
D2 × 104 km h-1
could anyone give me a detailed solution for this?
A fixed volume of water will dissolve a certain amount of salt. If the same volume of water is then heated, more salt can be made to dissolve in it. The best explanation to this is________.
AHeating increases the spaces between the water molecules
BHeating reduces the size of the salt particles
CSalt melts in hot water
DBoth water and salt particles become smaller when heated
During the process of inhalation in human beings _________.
(A) Diaphragm contracts but external intercoastal muscles and lungs expand.
(B) Diaphragm expands but external intercoastal muscles and lungs contract.
(C) Diaphragm and external intercoastal muscles expand but lungs contract.
(D) Diaphragm and external intercoastal muscles contract but lungs expand.
Which of the following statements are incorrect?
(i) Cellular respiration is a physical process in which food molecules are broken down into carbon dioxide and water.
(ii) Anaerobic respiration involves breakdown of glucose into alcohol and carbon dioxide.
(iii) Breathing rate varies according to oxygen requirement of the body.
(iv) On land, frogs breathe through lungs and in water by gills.
(v) Respiration in plants occurs through stomata and lenticels.
A(i), (ii) and (iv) only
B(i) and (iv) only
C(ii), (iii) and (v) only
D(ii), (iii) and (iv) only
i doubt on it . how could cellular respiration could be a physical one.