Physics MCQS

31. At high altitude, the blood oozes out of the nose and ear because:

A. The blood pressure increases at high altitudes
B. The percentage of oxygen in the air increases
C. The atmospheric pressure decreases there
D. The density of blood decreases at high altitudes

32. The velocity of falling raindrops attains a limited value because of:

A. Up thrust of air
B. Air currents of the earth atmosphere
C. Surface tension effect
D. Viscous force exerted by air

33. Ball pen functions on the principle of:

A. Viscosity
B. Boyle’s law
C. Gravitational force
D. Surface tension

34. With the increase of temperature, viscosity:

A. Increases
B. Decreases
C. Remains the same
D. Doubles

35. According to Stokes law, drag or viscous force depends on:

A. Initial velocity
B. Final velocity
C. Terminal velocity
D. Instantaneous velocity

36. The smooth or steady-line flow is known as:

A. Laminar flow
B. Turbulent flow
C. Both A and B
D. None of the above

37. Blood has a density:

A. Nearly equal to that of water
B. Greater than water
C. Lesser than water
D. None of the above

38. The pressure will be low where the speed of the fluid is:

A. Zero
B. High
C. Low
D. Constant

39. At high altitude, the blood oozes out of the nose and ear because:

A. The blood pressure increases at high altitudes
B. The percentage of oxygen in the air increases
C. The atmospheric pressure decreases there
D. The density of blood decreases at high altitudes

40. What is the half-life of Radium-226?
(A) 1220 Years
(B) 1420 Years
C) 1620 Years
(D) 1820 Years