All questions

• Which of the following polymers is used to manufacture clothes for firefighters? The correct answer is option C) Nomex Explanation:: Nomex is a flame-resistant meta-aramid material hence used in manufacturing firefighters... Chemistry 1 answer
• Which polymer is used in the manufacture of paints and lacquers? Correct answer is option B) Glyptal Explaination:: Gylptal is a polymer obtained by condensation polymerization of glycerol and phthalic anh... Physics 1 answer
• A gas contained in a cylinder fitted with a frictionless piston expands against a constant external pressure of 1 atm 106.5 J is the correct answer Solution:: Rotational Dynamics 2 answers
• In thermodynamics, heat and work are : (1) Extensive thermodynamic state variables (2) Point functions (3) Path functions The correct answer is option 3) path function Physics 2 answers
• One main scale division of a vernier callipers is 'a' cm and nth division of the vernier scale coincide with (n – 1)th The correct answer is option D) 10aover n Explanation:: Physics 1 answer
• A 25 m long, antenna is mounted on an antenna tower. The height of the antenna tower is 75 m. The correct answer is option 3) 100 m Explanation: height of antenna= λover 4 25= λover 4 λ=100 Physics 1 answer
• The maximum and minimum distances of comet from the Sun are 1.6 × 1012 m and 8.0 × 1010 m respectively The correct answer is option A) 3.0×10³ m/s Explanation:: L=mv₁r₁=mv₂r₂ V₂= v₁r₁over r₂ =v₁ 8×10¹⁰over 160×10¹⁰ =6×10⁴over 20 =3000 m/s Physics 1 answer
• 22 Ne nucleus, after absorbing energy, decays into two α-particles and an unknown nucleus. The unknown nucleus is The correct answer is option B) carbon Explanation:: ²²Ne decays α particle = He²⁺ Mass No = 4 p=2,n=2 So, New mass no. =22−8=14 Atomic No.... Physics 1 answer
• Which of the following statement(s) is (are) correct ? (A) The rest mass of a stable nucleus is less than the The correct answer is option A ) The rest mass of a stable nucleus is less than the sum of the rest masses of its separated nucleons. Physics 2 answers
• The electron in a hydrogen atom makes a transition from an excited state to the ground state. Which of the following statements is true? The correct answer is option A) Its kinetic energy increases and its potential and total energies decrease. Physics 1 answer
• Photoelectrons are emitted when 400 nm radiation is incident on a surface of work function 1.9eV. =-54.4 eV, -13.6 eV, -6.04 eV, -3.4 eV, -2.176 ev, -1.51 eV Difference of energies lying between 2 and 4 eV is -3.4+6.04=2.64 eV -2.176+6.04... Physics 2 answers
• The ratio of series limit wavelength of Balmer series to wavelength of first line of paschen series is ………. 7/36 is answer https://lh3.googleusercontent.com/-djiaQ2JfDPE/YayM6Plq9AI/AAAAAAAAC2o/a8czELAm8tUaT_CogztAF--yBfNQCikxwCNcBGAsYHQ/image.png Physics 1 answer
• A parallel beam of uniform, monochromatic light of wavelength 2640 A has an intensity of 200W/m2 . The number of photons in 1mm3 of this radiation are …. Solution is 884 photons/mm³ Physics 1 answer
• A aeroplane is flying horizontally with speed of 432 km/hr at height h meter from ground. Its angle of elevation The correct answer is option A)1200 sqrt3 Explanation:: Uncategorized 1 answer
• Mass of Li3+ is 8.33 times mass of proton Li3+ and proton are accelerated through same potential difference. Then ratio of debroglie's The correct answer is 2 Explanation:: Physics 1 answer
• The gas evolved due to anaerobic degradation of vegetation causes? the correct option is a) Global warming and cancer Explanation:: The gas CH4 evolved due to anaerobic degradation of vegetation which causes... Random 1 answer
• Is Maharashtra board exam 2021 postponed ? Class 10 Secondary School Certificate (SSC) board and Class 12 Higher Secondary Certificate (HSC) board examinations have been postponed by... Discuss 1 answer
• If A and B are two skew-symmetric matrices of order n, then, (a) AB is a skew-symmetric matrix (c) is the correct option We are given A’ = -A and B’ = -B; Now, (AB)’ = B’;A’ = (-B) (-A) = BA = AB, if A and B commute. Rotational Dynamics 1 answer
• If A=[ 1 2 2 2 1 2 2 2 1] and A^-1 exists and A≠0 , then (A^2-4A)A^-1= The correct answer is option a) beginbmatrix -3& 2 & 2\\ 2 & -3& 2\\ 2&2&-3 endbmatrix Video explaination:: https://youtu.be/7B6Et9Lb3gw Uncategorized 1 answer
• A stationary body explodes into two fragments each of rest mass 1kg that move apart at speeds of 0.6c relative to the original body Correct answer is option is B) 2.5 kg Physics 1 answer
• Find the initial momentum of electron if the momentum of electron is changed by pm and the De Broglie wavelength associated with it changes by 0.50 % Initial momentum is 200p_m Explaination: dλoverλ× 100 =0.5 dλoverλ× 100 =0.5over100=1over200 and triangle p=p_m p=hoverλ, differentiating dp... Physics 1 answer
• Given that x = -9 is a root of ||The other two roots are ______ and ________ . the correct answer is available here watch this video by neha mam Uncategorized 2 answers
• If the lines ax + y + 1 = 0, x + by + 1 = 0 and x + y + c = 0 (a, b, c being distinct and different from 1 ) are concurrent, then value of The correct answer is option c) 1 if the given lines are concurrent , then beginarray|ccc|cc| a& 1 & 1 \\ 1 & b & 1\\ 1 &1 & c\\ endarray=0... Uncategorized 1 answer
• The top of a ladder 6 metre long is resting against a vertical wall on a level pavement, Answer: The top slides down at 1/√(5) ≈ 0.447 m/s. Let the foot of the ladder be x m from the wall and the top be y m above the ground. The... Mathematics 1 answer