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Showing posts with label physics. Show all posts
Showing posts with label physics. Show all posts

Monday 21 December 2015

If density of oxygen is 16 times that of hydrogen, what will be thier corresponding ratio of velocity of sound

SSC CHSL 2015

Question If density of oxygen is 16 times that of hydrogen, what will be thier corresponding ratio of velocity of sound

A) 2:1
B) 4:1
C) 1:4
D) 1:16

Answer:  4:1

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Hydraulic brakes work on the principle of

Question Hydraulic brakes work on the principle of

A) Newton's law
B) Thomson's law
C) Pascal's law
D) Bernoulli's theorem

Answer: Pascal's law

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Sunday 13 December 2015

In which of the following convection takes place?

Question In which of the following convection takes place?

A) Solids and liquids only
B) Liquids and gases only
C) Gases and solids only
D) Solids, liquids and gases

Answer: Liquids and gases only

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A body falling freely under the action of gravity has

Question 112 A body falling freely under the action of gravity has

A) Maximum Weight
B) Minimum Weight
C) Variable Weight
D) No Weight

Answer: No Weight

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Saturday 24 October 2015

During the recent Venus transit (June 2012), the planet appeared as a tiny black circle moving on the Sun. The black colour on the Sun is because the planet

Question 60 During the recent Venus transit (June 2012), the planet appeared as a tiny black circle moving on the Sun. The black colour on the Sun is because the planet

A) is black in colour
B) obstructed all light from the Sun
C) was invisible due to bright rays from the Sun
D) behaved as a black hole during its transit

Answer: was invisible due to bright rays from the Sun

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The waves that helps scientists to understand the internal structure of the Earth are

Question 51 The waves that helps scientists to understand the internal structure of the Earth are

A) primary waves
B) secondary waves
C) surface waves
D) longitudinal waves

Answer: surface waves

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A device which is used in our TV set, Computer, Radio set for storing the electric charge is

Question 46 A device which is used in our TV set, Computer, Radio set for storing the electric charge is

A) resistor
B) inductor
C) capacitor
D) conductor

Answer:  capacitor

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It is difficult to cut things with a blunt knife because

Question 24 It is difficult to cut things with a blunt knife because

A) the pressure exerted by knife for a given force increses with increase in bluntness
B) A sharp edge decreases the pressure exerted by knife for a given force
C) a blunt knife decreases the pressure for a given force
D) a blunt knife decrease the area of intersection

Answer: a blunt knife decreases the pressure for a given force

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Thursday 22 October 2015

When deep-sea fishes are brought to the surface of the sea, their bodies burst. This is because the blood in their bodies flows at very

Question 23 When deep-sea fishes are brought to the surface of the sea, their bodies burst. This is because the blood in their bodies flows at very

A) high speed
B) high pressure
C) low speed
D) low pressure

Answer: high pressure

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Monday 19 October 2015

Ball bearings are used in bicycles, cars, etc., because

Question 88 Ball bearings are used in bicycles, cars, etc., because

 A ) The actual area of contact between the wheel and axle is increased
 B ) The effective area of contact between the wheel and axle is increased
 C ) The effective area of contact between the wheel and axle is reduced
 D ) None of the statements is correct

Answer: The effective area of contact between the wheel and axle is reduced

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Friday 9 October 2015

SI unit of the thermal conductivity of a material

Question 87 Which one of the following is the SI unit of the thermal conductivity of a material?

A) Wm-1K-1
B) Wm/K
C) Wm-1/K-1
D) Js-1m-1K
Answer: Wm-1K-1

Explanation: In SI units, thermal conductivity is measured in watts per meter kelvin (W/(m. K))

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Which of the following statements regarding heavy water are correct?

Question 95 Which of the following statements regarding heavy water are correct?

1. It is extensively used as a moderator in nuclear reactors
2. It cannot be used in exchange reaction to study reaction mechanism
3. Viscosity of heavy water is relatively smaller than that of ordinary water
4. The dielectric constant of heavy water is smaller than that of ordinary water
Select the correct answer using the code given below:
A) 1 and 2
B) 2 and 3
C) 3 and 4
D) 1 and 4

Answer: 1 and 4

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Conservation of momentum in a collision between particles can be understood on the basis of

Question 96 Conservation of momentum in a collision between particles can be understood on the basis of:

A) Newton's first law of motion
B) Newton's second law of motion
C) Both Newton's second law of motion and Newton's third law of motion
D) Conservation of energy

Answer: Both Newton's second law of motion and Newton's third law of motion

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To weld metals together, high temperature is required. Such a high temperature is obtained by burning

Question 98 To weld metals together, high temperature is required. Such a high temperature is obtained by burning:

A) Acetylene in oxygen
B) LPG in oxygen
C) Methane in oxygen
D) Acetylene in nitrogen

Answer: Acetylene in oxygen

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Magnetic meridian is an imaginary

Question 100 Magnetic meridian is an imaginary

A) line along north-south
B) point
C) vertical plane
D) horizontal plane

Answer: line along north-south

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SI unit of force 'Newton' (N) is given by

Question 104 In SI unit of force 'Newton' (N) is given by (where m stands for metre and s stands for second);

A) 1 N = 1 kg/ms2
B) 1N = 1kgm/s2
C) 1N = 1 kgs2/m
D)1 N = 1 kgms2

Answer: 1N = 1kgm/s2

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The loudness of sound is related to

Question 109 The loudness of sound is related to:

A) its frequency
B) its amplitude
C) its speed
D) its pitch

Answer: its amplitude

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Wednesday 30 September 2015

Which one among the following colours has the highest wavelength?

CDS-II-2013 Questions

Question: Which one among the following colours has the highest wavelength?

A) Violet
B) Green
C) Yellow
D) Red

Answer: Red

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Monday 14 September 2015

Optical fibres, though bent in any manner allows light to pass through. What is the inference that one can draw from it?

NDA NA Exam I 2015 Questions

Question 70 Optical fibres, though bent in any manner allows light to pass through. What is the inference that one can draw from it?

A) The concept that light travels in straight path is wrong
B) Light can flow through optical fibres
C) Light can travel through the fibres because of their ductility
D) Light can travel through the fibres due to multiple total internal reflections

Answer: Light can travel through the fibres due to multiple total internal reflections

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