A graph is plotted between angle ofdeviation (d) and angle of incidence (i) for a prism. The nearly correct graph is
For a prism, as the angle of incidence increases, the angle of deviation first decreases, goes to a minimum value... View Article
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A lead bullet of mass 2 Kg, travelling with a velocity of 20 m/s, comes to rest after penetrating 20m in a still target. Find the resistive force applied by the target and acceleration of the bullet.
We know that, v2 = u2 – 2 as v = 0 m/s u = 20 m/s, s = 20m... View Article
A parallel plate capacitor is made by stacking equally spaced plates connected alternately. If the capacitance between any two plates is then the resultant capacitance is [NCERT 1971; DPMT 2001; MP PMT 2003; AIEEE 2005]
The givenarrangement becomes an arrangement of (n-1) capacitors connected in parallel. So CR=(n-1)C
Choose the correct statements: Statement 1: We see objects, when light emitted from the objects enter our eyes Statement 2: We see objects, when light reflected from the objects enter our eyes Statement 3: Eyes alone cannot see an object Statement 4: Eyes emit light rays in all direction
We see objects, when light emitted from the objects enter our eyes but eyes alone cannot see an object
What is light?
Answer: Light is an electromagnetic wave emitted by hot objects like lasers, bulbs, and the sun. Light is a type... View Article
In a compound microscope, if the objectiveproduces an image Io and the eye piece produces an image Ie, then [MP PET 1990]
In compound microscope objective forms real image while eye piece forms virtual image.
The waves used in telecommunication are
In telecommunication, microwaves are used. Telecommunication refers to the process of exchange of information by using electronic devices over a... View Article
Choose the correct answer regarding luminous objects: Statement 1: Objects which emit light on their own are known as luminous objects Statement 2: Luminous objects are responsible for our vision Statement 3: Candle and earth are examples of luminous objects Statement 4: luminous objects reflect and emit light
Answer: Statement 1, 2 and 4 are correct Objects that emit their own light are called luminous objects. The human... View Article
The law, governing theforce between electric charges is known as [CPMT 1972; MP PMT 2004]
Coulomb’s law is used to calculate the force between charges.
The lower portion of clouds are negatively charged, what effect would it have on the earth?
This is charging by induction. The negative charges attract the opposite (positive) charge towards them.
Light from sodium lamp is passedthrough cold sodium vapours, the spectrumof transmitted light consists of [MP PET 1989; RPMT 2001]
According to Kirchhoff’s law, a substance in unexcited state will absorb these wavelength which it emits in de-excitation.
Fraunhofer lines are obtained in [CPMT 1973; MP PMT 1989; MP PMT 2004]
A) Solar spectrum B) The spectrum obtained from the neon lamp C) Spectrum from a discharge tube... View Article
Choose the right answer from the following
We use flint glass prism to disperse polychromatic light because light of different colours: Travel with same speed Travel with same... View Article
What do you understand by the gravitational force of earth and weight?
Weight:The force that gravitation exerts upon a body, equal to the mass of the body times the local acceleration of gravity: commonly taken, in a region of constant gravitational acceleration, as a measure of mass. Any object on the Earth or at least close to Earth, will experience a gravitational... View Article
Iftwo streams of protons move parallel to each other in the same direction, then they[MP PET 1999; AIIMS 2004]
For charge particles, if they are moving freely in space, electrostatic force is dominant over magnetic force between them. Hence... View Article
A conducting circularloop of radius r carries a constant current i. It is placed in a uniform magnetic field , such that is perpendicular to the plane of the loop. The magnetic force acting on the loop is[BIT 1992; MP PET 1994; IIT 1983;MP PMT 1999; AMU (Engg.) 2000]
Net force on a current carrying closed loop is always zero, if it is placed in an uniform magnetic field.
Which of the following object is luminous?
Luminous objects have their own light. Light is produced/comes from luminous objects which is responsible for our vision. Ex-... View Article
If you are given with a force of magnitude 25 N acting on a body of mass 2 kg increases its kinetic energy from 100 J to 200 J. The displacement of the body during this interval is
Work done by the force would be equal to the change in kinetic energy of the body. The change in... View Article
If the distance between the objects increase, mass remaining same then the gravitational forces between the objects will :-
Gravitational force is given by F=GMm/r2 That implies Force is inversely proportional to distance between the objects. Therefore, If... View Article
Total internal reflection oflight is possible when light enters from [CPMT 1973; MP PMT 1994]
For total internal reflection light must travel from denser medium to rarer medium.
