What is zero uniform velocity motion?
Answer: With respect to time, we may describe motion as the change of an object’s location. Water flowing from the tap,... View Article
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What is a non-recording rain-gauge?
Answer: Rain gauges are classified as either non-recording or recording. A rain gauge is a type of instrument used by... View Article
Speed of sound is maximum in which among the following? A) Gases B) Vaccum C) Liquids D) Solids
Speed of sound is maximum in solids and decreases from solids to liquids and liquids to gases. Sound can’t travel... View Article
What is an equiconvex lense?
A lens is made up of two curved surfaces which can be concave or convex surfaces. When both the surfaces... View Article
A particle of mass 10g moves along a circle of radius 6.4 cm with a constant tangential acceleration. What is the magnitude of this acceleration if the kinetic energy of the particle becomes equal to 8×10^-4J by the end of the second revolution after the beginning of the motion?
The kinetic energy is given as = 8 × 10-4 J or, 1/2 mv² = 8 × 10-4 or, 1/2... View Article
What is the dimensional formula for thermal resistance?
Thermal resistance is the property of heat, and it is the measurement of difference in temperature in which the flow... View Article
What is simple manometer and differential manometer?
A simple manometer consists of a glass tube having one of its ends connected to a point where pressure is... View Article
Which mirror is used in headlights of cars? At what position is bulb placed in it and why?
Concave mirror is used in headlights of vehicles, because when the bulb of headlight is placed at focus of concave... View Article
List two merits of solar cells
Merits of solar cell Solar power is pollution free and causes no greenhouse gases to be emitted after installation. The... View Article
What are optical and non-optical aids?
An optical aid is used in conjunction with the eye i.e. using optical instruments for improving the vision whereas non-optical... View Article
Magnetic permeability is maximum for (a) diamagnetic substances (b) paramagnetic substances (c) ferromagnetic substances (d) all of these
The more conductive a material is to magnetic fields, the higher its permeability. magnetic permeability is maximum for ferromagnetic substance.... View Article
An electric bulb is connected to a 220v generator the current is 0.50A. What is the power of the bulb?
Answer: Power is defined as the rate at which work is done upon an object. Power is a time-based quantity.... View Article
The intensity of light depends on- 1) amplitude 2) frequency 3) wavelength 4) none
The intensity of a wave is directly proportional to the amplitude of the wave. Light is an electromagnetic wave. its... View Article
Which is the most important property of Nanomaterials? A) Force B) Friction C) Pressure D) Temperature
Friction (B) is the most important property of nano metals. Nanomaterials are special for several reasons, but for one in... View Article
When a solid body is negatively charged by friction, it means that the body has (a) acquired excess of electrons (b) lost some, problems (c) acquired some electrons and lost a lesser number of protons (d) lost some positive ions
When a solid body is negatively charged by friction, it means that the body has acquired excess of electrons. If... View Article
How do you apply the correction due to zero error?
Zero error is simply the reading of the measuring device when input quantity is zero . To correct such an... View Article
A short bar magnet of magnetic moment 0.4J T^-1 is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is(a) –0.064 J(b) zero(c) –0.082 J(d) 0.064 J
For stable equilibrium U = -MB = – (0.4)(0.16) = – 0.064 J
When a body moves uniformly along the circle, then:- (a) its velocity changes but speed remains the same (b) its speed changes but velocity remains the same (c) both speed and velocity changes (d) both speed and velocity remains same
The correct answer is (a) its velocity changes but speed remains the same Solution A uniform circular motion is the movement... View Article
A 6-ohm resistance wire is doubled by folding. What is the new resistance?
Answer: The electrical resistance of a circuit is the ratio between the voltage applied to the current flowing through it.... View Article
What is a refractive mirror?
The process of bending of light while travelling from one medium to another is called refraction . Refractive Mirror reflect... View Article
