General Awareness Quiz – Physics
General Awareness Quiz Set 23 for SSC CGL, SSC CHSL and Railways exams. General Science- Physics Quiz for SSC CGL, SSC CHSL, Railways etc.
Topic: Physics
- The dimensional formula for universal gravitational constant is:
A) M¯¹L³T²
B) ML²T¯²
C) M¯²
D) M¯¹L³T¯²
View answer
Option D.
Explanation: Universal Constant of Gravitation is represented by G and derived from Newton’s law of gravitation. Dimensional Formula of Universal Constant of Gravitation=(M¹L¹T¯² xL²)/(M¹xM¹)=M¯¹L³T¯²
- Centrifugal and Fahrenheit temperatures are same at:
A) 32°
B) 40°
C) -40°
D) -273°
View answer
Option C.
Explanation: – 40°
- The radiation of a laser beam is:
A) Coherent and non Monochromatic.
B) Non coherent and non Monochromatic.
C) Coherent and Monochromatic.
D) Non coherent and Monochromatic.
View answer
Option C.
Explanation: Coherent and Monochromatic. Laser, an acronym for Light Amplification by Stimulated Emission of Radiation, creates a radiation Beam that is coherent (in-phase). In a coherent light Source, the amplitude of the radiated waves is added and results in a radiation beam of great intensity. It normally produces only one or two wavelengths. The Single wavelength is called monochromatic radiation.
- Ohm’s is valid in case of:
A) Semiconductor
B) Conductor
C) Superconductors
D) Insulator
View answer
Option B.
Explanation: Conductor. Ohm’s law states: the current through a conductor between two points is directly proportional to the potential difference across the two points. It defines the relationship between the three fundamental electrical quantities: current, voltage, and resistance.
- The mass of a body measured by the a physical balance in a lift at rest is found to b m. If the lift is going with acceleration a its mass will be measured as:
A) m(1-a/g)
B) m(1+a/g)
C) m
D) zero
View answer
Option C.
Explanation: Mass is the quantity of matter possessed by body. It will be the same even if the lift goes up with acceleration.
- When two semiconductors of p-type and n-type are brought in contact the formed p-n junction which acts like a/an
A) Amplifier
B) Oscillator
C) Conductor
D) Rectifier
View answer
Option D.
Explanation: Rectifier. P-n junction is a device which flows current in one direction when it is forward biased and when it is reverse biased it doesn’t flow any current through it. So it acts as an rectifier device to convert sinusoidal current to uni-direction. Rectifier converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction.
- When a body immersed in liquid, force acting on it
A) Weight
B) Mass
C) Upthrust
D) Both A and C.
View answer
Option D.
Explanation: According to the Principle of Flotation, when a body is immersed in a fluid, two forces act on it. The weight of the body acting vertically downward through the centre of gravity of the body, and (2) the Upthrust of the fluid acting vertically upward through. The centre of gravity of the fluid displaced, i.e., centre of buoyancy. The upthrust is also termed as buoyant Force.
- A white and smooth surface is
A) Good absorber and Bad reflector of heat.
B) Good absorber and Good reflector of heat.
C) Bad absorber and Good reflector of heat.
D) Bad absorber and Bad reflector of heat.
View answer
Option C.
Explanation: Shiny surfaces are poor absorbers of heat radiation and the best reflectors of heat radiation. Black surfaces are the best emitters and best absorber of heat radiation.
- In a filament type light bulb most of the electric power consumed as appears as
A) Infra red rays
B) Visible light
C) Fluorescent light
D) Ultra violet rays
View answer
Option A.
Explanation: When electricity is passed through the filament the filament gets hot. And then depending upon the temperature of filament, radiation is emitted from the filament. The flament’s temperature is very high, generally over 2,000 °C. At this high temperature of 2,000°C, about 5 percent of the electrical energy converts into visible light and rest of it is emitted as heat or iinfrared radiation.
- When a stone is thrown in the calm water of pond the waves produced on the surface of water in the pond are:
A) Transverse
B) Longitudinal
C) Both Longitudinal and Transverse
D) Waves are not produce
View answer
Option A.
Explanation: The waves produced on the surface of water the pond is an example of transverse wave particles of the medium do not move along with wave. Only the disturbance is carried for another example of such waves is the vibrations string.
