Questions and answers for exam Preparation

MCQs

Total Questions : 10

Question 1.

10. Which of the following statements about Magnetic Resonance Imaging is not true?

It is a medical imaging technique used in radiology to visualize internal structures of the body in detail
MRI makes use of the property of nuclear magnetic resonance (NMR) to image nuclei of atoms inside the body.
MRI uses ionizing radiation to produce detailed analysis of the body
MRI machines make use of the fact that body tissue contains lots of water, and hence protons which get aligned in a large magnetic field

Discuss Question

Answer: Option C. -> MRI uses ionizing radiation to produce detailed analysis of the body
:
C

Option:(c)

Question 2.

9. Which of the following is not one of the laws of thermodynamics?

1. The increase in internal energy of a closed system is equal to the difference of the heat supplied to the system and the work done by it
2. Heat cannot spontaneously flow from a colder location to a hotter location
As a system approaches absolute zero the entropy of the system approaches a minimum value
A perpetual motion machine can be designed by gradually lowering a system from higher temperature to lower temperature

Discuss Question

Answer: Option D. -> A perpetual motion machine can be designed by gradually lowering a system from higher temperature to lower temperature
:
D

Option:(4)

Question 3.

The surface of water in a pond remains cool even on a hot day because

water evaporates at the surface and evaporation causes cooling
the heat absorbed at the surface is transmitted downwards
water in a contact with the bottom of the pond becomes cool and rises to the surface due to convention
none of these

Discuss Question

Answer: Option A. -> water evaporates at the surface and evaporation causes cooling
:
A

Option:(a)

Question 4.

A liquid is flowing in a streamlined manner through a cylindrical pipe. Along a section containing the axis of the pipe, the flow profile will be

Discuss Question

Answer: Option A. ->

:
A

Option:(a)

Question 5.

Scalding with steam is more severe than scalding by boiling water because

steam can penetrate the skin
steam is at a higher temperature
steam contains more energy than boiling water
steam is at a higher pressure

Discuss Question

Answer: Option C. -> steam contains more energy than boiling water
:
C

Option:(c)

Question 6.

One feels cold after a dip in sea water due to

convection currents
the deposition of salt on the body
the evaporation of water on the body
the difference in temperatures between land and sea

Discuss Question

Answer: Option C. -> the evaporation of water on the body
:
C

Option:(c)

Question 7.

Which of the following is the correct sequence of the regions of the sun as one moves from its core to the surface?
1.Photosphere
2.Chromosphere
3.Convection zone
4.Corona

1, 2, 3, 4
1, 3, 4, 2
2, 3, 4, 1
2, 1, 3, 4

Discuss Question

Answer: Option A. -> 1, 2, 3, 4
:
A

Option:(a)

Question 8.

Perspiration is maximum when

temperature is high and air is dry
temperature is high and air is humid
temperature is low and air is humid
temperature is low and air is dry

Discuss Question

Answer: Option B. -> temperature is high and air is humid
:
B

Option:(b)

Question 9.

During summer, we feel comfortable under a fan because it

throws cool air on us
sets the air in motion, thereby increasing the evaporation of sweat
produces convection currents
produces air which carries heat away from the body

Discuss Question

Answer: Option B. -> sets the air in motion, thereby increasing the evaporation of sweat
:
B

Option:(b)

Question 10.

Consider the following statements:
1.In a direct-to-home (DTH) system, the viewers' dish antenna picks up signals from the satellite directly.
2.Cable operators receive signal from the satellite on large community dish antennas and then transmit to viewers' sets.
Which of the above statements is/are correct?