General Science Questions (MCQs) for Competitive Examinations
General Science Multiple choice questions for GK paper in SSC, NDA, CDS, UPSC, UPPSC and State PSC Examinations. These questions are part of GKToday’s 35000+ MCQs Bank Course in GKToday Android App
11. What is the difference of pressure between two sides of the liquid surface called as?
[A] Excess Pressure
[B] Surface Pressure
[C] Fluidic Tension
[D] Viscosity
Show Answer
Correct Answer: A [Excess Pressure]
Notes:
In equilibrium the pressure inside a bubble or drop is more than the pressure outside. The difference of pressure between two sides of the liquid surface is called as excess pressure.
12. Which of the following represents angular frequency of a body?
[A] twice the frequency of the body
[B] product of frequency of the body with π
[C] half the frequency of the body
[D] product of frequency of the body with 3 π
Show Answer
Correct Answer: A [twice the frequency of the body]
Notes:
Angular frequency of a body executing periodic motion is equal to product of frequency of the body with factor 2π. Angular frequency = 2 π n The unit of Angular frequency will be rad per second.
13. Which of these is correct about Simple Harmonic Motion?
[A] Restoring force is directly proportional to the displacement from mean position
[B] Restoring force is equal to the displacement from mean position
[C] Restoring force is inversely proportional to the displacement from mean position
[D] Restoring force is half of the displacement from mean position
Show Answer
Correct Answer: A [Restoring force is directly proportional to the displacement from mean position]
Notes:
Simple harmonic motion is a special type of periodic motion, in which a particle moves to and fro repeatedly about a mean position under a restoring force which is always directed towards the mean position and whose magnitude at any instant is directly proportional to the displacement of the particle from the mean position at that instant. Restoring force Displacement of the particle from mean position.
14. What will be the apparent frequency when the both source of the sound and listener move in the same direction with same velocity?
[A] it will be more than the actual frequency
[B] it will be less than the actual frequency
[C] it will be equal to the actual frequency
[D] None
Show Answer
Correct Answer: C [it will be equal to the actual frequency]
Notes:
When both moves in the same direction with same velocity n’ = n, i.e. there will be no Doppler effect because relative motion between source and listener is zero.
15. What is the relationship between Kelvin scale temperature (T) and Celsius scale temperature (tc)?
[A] T = tc + 273.15
[B] T = tc – 273.15
[C] T = tc + 100
[D] T = tc – 100
Show Answer
Correct Answer: A [T = tc + 273.15]
Notes:
The size of unit in Kelvin and Celsius temperature scales is the same. So, T = tc + 273.15.
16. In which of the following cases a concave mirror will form a virtual and erect image?
[A] when object is placed at infinity
[B] when object is at focus
[C] when object is between pole and focus
[D] None of the above
Show Answer
Correct Answer: C [when object is between pole and focus]
Notes:
When the object is between pole and focus, a concave mirror will form a virtual and erect image.
17. Which of the following metals is mostly used for filaments of electric bulbs?
[A] Copper
[B] Silver
[C] Nickel
[D] Tungsten
Show Answer
Correct Answer: D [Tungsten ]
Notes:
Tungsten is mostly used to manufacture filaments of electric bulbs. Among all the metals, Tungsten has the highest melting point. Its symbol is W, its atomic number is 74, and its atomic weight is 183.85. It is used in many other high temperature application because of its high melting point.
18. What is the total charge of the electric dipole?
[A] 0
[B] -1
[C] +1
[D] None of the above
Show Answer
Correct Answer: A [0 ]
Notes:
The total charge of the electric dipole is zero.
19. Which of the following is NOT a natural magnet?
[A] lodestone
[B] pyrrhotite
[C] columbite
[D] titanium
Show Answer
Correct Answer: D [titanium]
Notes:
An example of a natural magnet is the lodestone, also called magnetite. Other examples are pyrrhotite, ferrite, and columbite.
20. What is the susceptibility of a diamagnetic material?
[A] positive and small
[B] positive and large
[C] negative
[D] None
Show Answer
Correct Answer: C [negative]
Notes:
In terms of the susceptibility χ , a material is diamagnetic if χ is negative, para- if χ is positive and= small, and ferro- if χ is large and positive
