Physics

DIFFERENTIATION FORMULA OF 'tan x' DIFFERENTIATION FORMULA  OF  'cot x '

DENSITY - DEFINITION, SYMBOL, FORMULA, UNITS AND DIMENSION

TRIGONOMETRIC IDENTITIES TRIGONOMETRY: What exactly is trigonometry? Trigonometry is primarily concerned with angles and triangles.The study of angles and how they affect various quantities and measures is known as trigonometry.Trigonometry is used to learn about triangles and their relationships What are the trigonometric applications? The trigonometric method is used to determine the height of a building or mountain, as well as the length of a beam required to span a specific distance. The trigonometry method is used to calculate an object's torque and forces.Engineers use trigonometric methods to solve design and construction problems involving structures such as bridges and buildings. A navigation method that calculates the distance between a receiver and a satellite using the law of cosines. Trigonometric methods are used by astronomers to calculate the distances of stars and planets from Earth. Physicists use trigonometry to study wave behaviour, analyse signals, and predict

 

NEET PHYSICS TEST ARRANGEMENT: QUESTION: A capillary tube of radius 'r'   is immersed in water and the water rises it to a height h.The mass of the water in the capillary tube is 5 g. Another capillary tube of radius '2r' is immersed in water.The mass of the water   that will rise in the tube is; [A].     2.5 g [B].     5.0 g [C].   10.0 g [D].   20.0 g ANSWER: ANSWER - [C] SOLUTION: CAPILLARY RISE: A capillary tube (glass tube) of radius 'r 'is dipped in water, the surface pulls the capillary walls in downward direction. Capillary walls pull the surface in upward direction. By the way the water in the tube will rise above the adjacent liquid level till the forces get balanced. This rises what we called it as capillary rise WHAT ARE THE TWO FORCES ACTING AT EQUILIBRIUM? 1.      First one is the weight of the water column, acting downwards.              Weight of the water in the column = mass x gravity                                                        

NEET PHYSICS TEST ARRANGEMENT: QUESTION: A body weighs 72 N on the surface   of the earth.What is the gravitational force on it, at a height equal to half the radius of the Earth. [A]     48 N [B]     32 N [C]     30 N [D]     24 N ANSWER: ANSWER - [B] SOLUTION: GRAVITATIONAL FORCE: Earth’s gravity comes from all its mass. All its mass makes a combined gravitational pull on the mass of other body. Objects with more mass have more gravity. Gravity gets weaker with distance.  That is given by the Newton’s universal law of gravitation which states that ‘Every  body on the universe attracts every other body with a force which is directly proportional to the product of their masses and inversely proportional to  the square of the mean distance between them’. EXAMPLES: The gravitational pull on the moon pulls the seas towards it causing the ocean tides. The sun’s gravity keeps earth in orbit around it. GRAVITATIONAL  FORCE AT A HEIGHT EQUAL TO HALF THE RADIUS OF THE EARTH: ALITER

NEET PHYSICS TEST ARRANGEMENT:  #5 QUESTION: A coil of radius R rotating about a diametric axis with angular velovity ω in a uniform magnetic field B.Find the value of the maximum voltage developed. Radius R=10 cm and   B= 5x10 -5 T. For half rotation it takes a time of 0.2 sec.                          A.        3x10 -5 V                              B.         2.5x10 -5 V                               C.         5x10 -6 V                                             D.          5x10 -5 V         ANSWER:                                 ANSWER - B.        SOLUTION:           MAGNETIC FLUX LINKED WITH THE COIL:       INDUCED EMF: MAXIMUM VOLTAGE DEVELOPED:          

PHYSICS NEET TEST ARRANGEMENT: QUESTION: Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material.What will be the photoelectric current, if the frequency is halved and the intensity is doubled?                 A.       Doubled               B.        Four times               C.        One-fourth               D.        Zero ANSWER :                                                                                        ANSWER - D. SOLUTION: Reason: No photoelectric emanation will happen on the off chance that the frequency of the occurrence light is underneath the threshold frequency. The quantity of electrons radiated each second (Photoelectric flow) is relative to the intensity of incident light Kinetic energy increments with expansion in frequency over a threshold value. The greatest speed of the photoelectrons relies upon the frequency of the incident light. light. PHOTOELECTRIC EFFECT: The photoelectric effect includes lighting a metal surfac

COMPOUND MICROSCOPE: Compound microscope is a microscope uses the mix of two lenses to deliver a higher magnification.it is utilized in labs and principally utilized for the examination purpose.The absolute amplification created by a compound microscope not entirely settled by duplicating the amplification of the two lenses (objective and eye piece  lens) CONSTRUCTION: There are two lenses joined in a compound magnifying instrument (microscope) which permits a lot higher amplification. The compound magnifying instrument (microscpe) comprises of a long barrel shaped cylinder where one finish of the cylinder has an objective lens (small aperture and small focal length) and the opposite end has an eyepiece lens (the aperture and the focal  length are fairly bigger than the objective lens). Objective lens which centers a genuine picture of the object,the picture is additionally amplified by the eyepiece which gives the watcher a picture that is virtual, amplified and reversed (inverted) co

PHYSICS NEET TEST ARRANGEMENT #3 QUESTION: 1.      A screw gauge has a least count of 0.01 mm, there are 50 divisions in its circular scale,  then the pitch of the screw is…………                                 A.        0.01 mm                                 B.        0.25 mm                                 C.        0.5  mm                                 D.        1.0  mm ANSWER:                           ANSWER : C SOLUTION: As per question the least count of the screw gauge is 0.01 mm, total number of divisions on its circular scale is 50. Least count of any instrument is the littlest division that can be estimated utilizing the instrument.              pitch = Least count X  total number of divisions in the                                                        circular scale              Pitch of the screw = 0.01 mm X 50              Pitch of the screw = 0.5 mm

PHYSICS NEET TEST ARRANGEMENT:    QUESTION: A  40 microfarad  capacitor is connected to a 200 V, 50 Hz ac supply. The rms value of current in the supply is nearly,                          A.        1.7   A                          B.        2.05 A                          C.        2.5   A                          D.         25.1 A                                            ANSWER :                                                                                                                                      ANSWER - C SOLUTION: CAPACITIVE REACTANCE: Capacitive reactance of a capacitor is the effective  resistance  offered by the capacitor to the flow of current through it. RMS VALUE OF THE CURRENT: