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A thin copper wire of length L increases by 1% when heated from temperature T1 to T2. What is the percentage change in area when a thin copper plate having dimensions 2l×l is heated from T1 to T2?

The coefficient of linear expansion (α) is half the coefficient of superficial expansion( β). Mathematically the equation can be expressed... View Article

A Radio Transmitter Operates At A Frequency Of 880 Khz And Power Of 10 kW. The Number Of Photons Emitted Per Second Is :

Given: Power of transmitter = 10kW Power P = 10kW = \(\begin{array}{l} 10 * 10^{3} W\end{array} \) Frequency of the... View Article

An Ideal Fluid Flows Through A Pipe Of Circular Cross-section Made Of Two Sections With Diameters 2.5 Cm And 3.75 Cm. The Ratio Of The Velocities In The Two Pipes Is According to the equation of continuity

According to the equation of continuity \(\begin{array}{l} A_{1}v_{1} = A_{2}v_{2}\end{array} \) \(\begin{array}{l} \frac{v_{1}}{v_{2}} = \frac{A_{1}}{A_{2}} \end{array} \) =\(\begin{array}{l} \frac{\pi D_{2}^{2}/4}{\pi... View Article

A point object is placed at A distance of 30cm from a convex mirror of focal length of 30cm. The image will form at________

Answer: A point object is placed at A distance of 30cm from a convex mirror of a focal length of... View Article

The Scarce Resources Of An Economy Have (A) Single Usages (B) Unlimited Usages (C) Competing Usages (D) All Of These

The correct answer is (C) Competing Usages Explore more such questions and answers at BYJU’S.

Biradial Symmetry And Lack Of Cnidoblasts Are The Characteristics Of

Biradial symmetry and lack of cnidoblasts are the characteristics of Ctenoplana and Beroe. They belong to the phylum Ctenophora and... View Article

Choose The Correct Answer. The Scarce Resources Of An Economy Have. (A) Single Usages (B) Unlimited Usages (C) Competing Usages (D) None Of These

The correct answer is (C) Competing Usages Explore more such questions and answers at BYJU’S.

A resistance ‘R’ draws power ‘P’ when connected to an Ac source. If an inductance is now placed in series with the resistance, such that the impedance of the circuit becomes ‘Z’, the power drawn will be______________

Answer: P(R/Z)2 The power can be defined as the product of the square of the RMS current and the resistance. The... View Article

A Father Is Three Times As Old As His Son. In 12 Years Time, He Will Be Twice As Old As His Son. Find The Present Ages Of Father And The Son.

Let the present age of son be x And the present age of father be 3x As given in the... View Article

Excessive Parallel Processing Is Related To (A)First Generation(B)Third Generation(C)Fourth Generation(D)Fifth Generation

The correct answer is (D)Fifth Generation Explore more such questions and answers at BYJU’S.

A Projectile Can Have The Same Range R For Two Angles Of Projection. If T1 & T2 Be The Times Of Flight In The Two Cases Then What Is The Product Of Two Times Of Flight?

As given in the question Range is same for two angles of projection \(\begin{array}{l} \Theta and (90 – \Theta) \end{array}... View Article

Two masses A and B of 10 Kg and 5 Kg respectively, are connected with a string passing over a frictionless pulley at a corner of a table a shown in the adjoining diagram. The coefficient of friction of A with the table is 0.2. The minimum mass of C that may be placed on A to prevent it from moving is equal to?

Given that, Mass of A mA=10kg Mass of B mB=5kg Coefficient of friction μ=0.2 Now, the tension is T=mbg T=5×10 T=50N The... View Article

List The Advances In Technology That Have Improved Forensic Analysis

The advances in technology that have helped in improving forensic analysis are: X-ray Biopsy Autopsy C.T. scan Ultrasound Post mortem... View Article

The energy that should be added to an electron to reduce its de-Broglie wavelength from 1nm to 0.5nm is (A) Equal to the initial energy (B) Two times the initial energy (C) Three times the initial energy (D) Four times the initial energy

The correct answer is (C) Three Times The Initial Energy de-Broglie wavelength\(\begin{array}{l} \lambda \propto \frac{1}{\sqrt{KE}} \end{array} \) =\(\begin{array}{l} KE \propto... View Article

A small object of uniform density rolls up a curved surface with an initial velocity v’.it reaches up to a maximum height of 3v2/4g with respect to the initial position. The object is (A)Disc (B) Ring (C)Solid Sphere (D) Hollowsphere

The correct answer is (A) Disc The object is Disc. =\(\begin{array}{l} v = \sqrt{\frac{2gh}{1+\frac{k^{2}}{r^{2}}}} \end{array} \) =\(\begin{array}{l} v^{2} = {\frac{2g... View Article

Consider A System Of Two Identical Particles. One Of The Particles Is At Rest And The Other Has An Acceleration A. The Centre Of Mass Has An Acceleration (A)A(B)2A(C)1/2A(D)Zero

\(\begin{array}{l} \vec{a}_{cm} = \frac{m_{1}\vec{a}_{1} + m_{2}\vec{a}_{2}}{m_{1} + m_{2}} —[1] \end{array} \) As given in the question \(\begin{array}{l} m_{1} = m_{2}... View Article

When two bodies A and B are in thermal equilibrium, (A) The internal energy of the two bodies will be equal (B)The kinetic energy of all the molecules of A and B will be equal (C)The potential energy of all the molecules of A and B will be equal (D)The average kinetic energy of the molecules of the two bodies will be equal

The correct answer is (A)The Internal Energies Of The Two Bodies Will Be Equal. Explore more such questions and answers... View Article

Name The Leaders Who Formed The Swaraj Party

The two most influential leaders who formed the Swaraj Party were Chittaranjan Das, Motilal Nehru. Explore more such questions and... View Article

1 Km Is Equals To How Many Miles

1Km is equivalent to 0.6214 miles. Explore more such questions and answers at BYJU’S.

The Wave Number Of The First Line Of Balmer Series Of Hydrogen Is 15200 Cm−1. The Wave Number Of The First Line Of Balmer Series For Li 2+ Ion Is

As we now \(\begin{array}{l} \bar{v} = \frac{1}{\lambda} = R_{H} * Z^{2}[\frac{1}{n_{1}^{2}} – \frac{1}{n_{2}^{2}}] \end{array} \) For the 1st line of... View Article

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