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

Monday 14 September 2015

Why is graphite used in electrolytic cells?

NDA NA Exam I 2015 Questions

Question 83 Why is graphite used in electrolytic cells?

A) Graphite is soft and can be easily moulded into electrodes
B) Graphite is made of layers of carbon atoms which can slide
C) Graphite is inert to most of the chemicals and remains intact in electrolytic cells
D) Graphite is a good conductor of electricity

Answer: Graphite is inert to most of the chemicals and remains intact in electrolytic cells

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Thermal conductivity of aluminium, copper and stainless steel increases in the order

NDA NA Exam I 2015 Questions

Question 118 Thermal conductivity of aluminium, copper and stainless steel increases in the order

A) Copper < Aluminium < Stainless Steel
B) Stainless Steel < Aluminium < Copper
C) Aluminium < Copper < Stainless Steel
D) Copper < Stainless Steel < Aluminium

Answer: Stainless Steel < Aluminium < Copper

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Perspiration cools the body because

NDA NA Exam I 2015 Questions

Question 119 Perspiration cools the body because

A) presence of water on the skin is cooling
B) evaporation requires latent heat
C) water has a high specific heat
D) water is a poor conductor of heat

Answer: evaporation requires latent heat

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Monday 10 August 2015

For a missile launched with a velocity less than the earth's escape velocity, the total energy is

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Question 99 For a missile launched with a velocity less than the earth's escape velocity, the total energy is

A> Positive
B> either positive or negative
C> Zero
D> Negative

Answer: Negative

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A fuse wire is characterised by

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Question 98 A fuse wire is characterised by

A> High resistance and low melting point
B> High resistance and high melting point
C> Low resistance and low melting point
D> Low resistance and high melting point

Answer: High resistance and high melting point

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The Dynamo converts

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Question 79 The Dynamo converts

A) Electrical energy into Mechanical Energy
B) None of these
C) Mechanical energy into Electrical Energy
D) Mechanical Energy into Magnetic Energy

Answer: Mechanical energy into Electrical Energy

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The earth completes one rotation on its axis in

Question 67 The earth completes one rotation on its axis in: 

A) 23 hrs. 30 min.
B) 23 hrs. 56 min. 4.9 sec
C) 24 hrs
D) 23 hrs 10 min. 2 sec

Answer:  23 hrs. 56 min. 4.9 sec

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Question 68 In which year did Dada Saheb Phalke produce the first Feature film?

A)  1910
B) 1911
C) 1912
D) 1913

Answer: 1913

Explanation : first Feature film was Raja Harishchandra.

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Sunday 9 August 2015

It is easy to burst a gas-filled balloon with a needle than with a nail. It is because

Question 88 It is easy to burst a gas-filled balloon with a needle than with a nail. It is because

A> nail is more longer than needle
B> nail exerts more pressure than needle on the balloon
C> needle exerts more pressure than nail on the balloon
D> gas is reactive with the needle

Answer: needle exerts more pressure than nail on the balloon

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The velocity of sound in moist air is more than in dry air because the moist air has

Question 98 The velocity of sound in moist air is more than in dry air because the moist air has

A> less density than dry air
B> less pressure than dry air.
C> more pressure than dry air
D> more density than dry air.

Answer:  less density than dry air

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Thursday 23 July 2015

Mars Atmosphere and Volatile Evolution Mission is

Post 399
Engineering Services Examination 2015 GAT

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Question 117 Mars Atmosphere and Volatile Evolution Mission is:

A) A spacecraft launched by India
B) A collaborative project of ISRO and NASA
C) A spacecraft launched by USA
D) A collaborative project of NASA and European Space Agency

Answer: C) A spacecraft launched by USA

Explanation : Mars Atmosphere and Volatile EvolutioN Mission (MAVEN) is a robotic spacecraft launched by NASA which is a space Agency run by USA. So option C) A spacecraft launched by USA is correct.

Tuesday 14 July 2015

An object covers distance which is directly proportional to the square of the time. Its acceleration is

Post 336

SSC CHSL Questions 2014

Question 185 An object covers distance which is directly proportional to the square of the time. Its acceleration is

A) increasing
B) decreasing
C) zero
D) constant
Answer: If you know the answer then please comment with logic or mail us the solution on gksea.com@gmail.com.

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Question 186 If the horizontal range of a projectile is four times its maximum height, the angle of projection is

A) 30 degree
B) 45 degree
C) sin inverse of 1/4
D) tan inverse of 1/4
Answer: If you know the answer then please comment with logic or mail us the solution on gksea.com@gmail.com.


Friday 10 July 2015

A wire of resitance R is cut into n equal parts

Post 296

SSC CHSL Questions 2014

Question 159 A wire of resitance R is cut into n equal parts. These parts are then connected in parallel. The equivalent resistance of the combination will be

A) nR
B) R/n
C) n/R
D) R/n2

Answer : R/n2

Explanation:  because when a wire is cut in two equal parts then the resistance of the combination comes to be R/4.


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Question 160 A bullet hits and gets embedded in a solid block resting on a horizontal frictionless table. Which physical quantity is conserved in this process?

A) Momentum and kinetic energy
B) Momentum alone
C) Kinetic energy alone
D) Neither momentum nor kinetic energy

Answer: Momentum alone

If a wire of resistance R is melted and recast to half of its length, then the new resistance of the wire will be

Post 288

SSC CHSL Questions 2014

Question 197 If a wire of resistance R is melted and recast to half of its length, then the new resistance of the wire will be

A) R/4
B) R/2
C) R
D) 2R
Answer: R/2


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The unit of Plancks constant is

Post 287

SSC CHSL Questions 2014

Question 196 The unit of Plancks constant is 

A) Js
B) Js-2
C) J/s
D) Js2
Answer: Js

Explanation: value of Planck's constant is approx. 6.626176 x 10-34 joule-seconds.

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Which of these waves can be polarized?

Post 286

SSC CHSL Questions 2014

Question 195 Which of these waves can be polarized?

A) Sound waves in air
B) Longitudinal waves on a string
C) Transverse waves on a string
D) Light waves

Answer: Transverse waves on a string



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A moving neutron collides with a stationary alpha particle

Post 285

SSC CHSL Questions 2014

Question 194 A moving neutron collides with a stationary alpha particle. The fraction of the kinetic energy lost by the neutron is
A) 1/4
B) 1/16
C) 9/25
D) 16/25
Answer: Comment if you know the answer.


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Sunday 5 July 2015

Creation of something from nothing is against the law of

Post 226

Question 24 Creation of something from nothing is against the law of
A) constant proportios
B) conservation of mass energy
C) multiple proportions
D) conservation of momentum
Answer: conservation of mass energy

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plane mirror image formation

Post 219

Question 9 A person standing 1 m in front of a plane mirror approaches the mirror by 40 cm. The new distance between the person and his image in the plane mirror is
A) 60 cm
B) 1.2 m
C) 1.4 m
D) 2.0 m
Answer: 1.2 m
Explanation: Image fored in the plane mirror lies on the same distace on which object is lying away from the plae mirror.
Now he was standing 1 m away that is 100 cm
he walks towards plain mirror 40 cm
so the new distace b/w mirror and object is 60 cm
so the new distance bw image and object is 60 cm *2 = 120 cm that is 1.2 m.

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penetrating power of rays

Post 216
Question 5 In an observation, alpha - particles, beta-particles and gamma-rays have same energies. Their penetrating power in the givn medium in increasing order will be
A) alpha, beta, gamma
B)beta,gamma, alpha
C) alpha,gamma, beta
D) beta,alpha,gamma
Answer:  alpha, beta, gamma
Explanation: gamma is the most penetrating ray then come the beta particles which contains more penetration power than alpha particles.

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Tuesday 30 June 2015

Sir CV Raman was awarded Nobel Prize for his work on

Post 188

Question 75 Sir CV Raman was awarded Nobel Prize for his work on:
A) Cryogenics
B) Sonometer
C) Light Scattering
D) Radio activity
Answer : Light Scattering

Question 76 Which of the following does not have a Stupa?
A) Barhut
B) Dhamek
C) Ranchi
D) Sanchi
Answer: Ranchi

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