Earthquakes generate sound waves inside the earth.
Unlike a gas, the earth can experience both transverse
S and longitudinal P sound waves. Typically the
speed of S wave is about 4.0 km s-1, and that of P
wave is 8.0 km s-1. A seismograph records P and
S waves from an earthquake. The first P wave arrives
4 minutes before the first S wave. Assuming the
waves travel in straight line, at what distance does
the earthquake occur?
A 960 km
B 640 km
C 1920 km
D 2880 km
Read the given statements and mark the correct option.
Statement 1 : Bohr's orbits are called stationary orbits.
Statement 2 : Electrons remain stationary in these orbits for some time.
A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true and statement 2 is false.
D Both statements 1 and 2 are false.
The given table shows the relative volumes of blood
flowing through different organs at rest and during
Identify organs d, e, f and g and select the correct option.
A d - Kidneys, e - Heart, f - Muscles, g - Brain
B d - Brain, e - Kidneys, f - Muscles, g - Heart
C d - Heart, e - Muscles, f - Kidneys, g - Brain
D d - Brain, e - Kidneys, f - Heart, g - Muscles
Refer to the given figure of body cells and select the incorrect statements regarding X, Y and Z.
(i) Y maintains pH of blood.
(ii) Z is an important part of our immune system.
(iii) Z plays a key role in transporting gases in the blood.
(iv) The pigment present in X absorbs oxygen and transports it to the cells all over the body.
A(i), (ii) and (iv) only
B(i) and (iii) only
D(ii) and (iv) only
A small conducting rod of length l, moves with a uniform velocity v in a uniform magnetic field B as shown in figure.
A The end X of the rod becomes positively charged.
B The end Y of the rod becomes positively charged.
C The entire rod is unerringly charged.
D The rod becomes hot due to joule heating.
By Fleming's right-hand rule, current flows from X to Y, but which end actually receives the extra positive charge?