All questions
- Which among the following solids is NOT soft? Copper among the following solids is NOT soft 2
- consider statement-1 is a fallacy. statement-2 is a tautology (b) Statement I is true, Statement II is true; Statement II is not a correct explanation for Statement I Explanation: Statement I and II are... 1
- A student measured the length of a rod and wrote it as 3.50 cm. Which instrument did he use to measure it? Measured length of rod = 3.50 cm That means least count of the measuring instrument should be 0.01 cm = 0.1 mm For vernier scale 1 main scal... 1
- Let E0 denote the dimensional formula of the permittivity of vacuum. If M = mass, L = length, T = time and A = electric current, then: Correct option is B From Coulomb's law we know, F = 1 over 4π in ₀q₁q₂ over r² therefore in ₀ = 1 over 4π q₁q₂ over Fr² Hence, [ in ₀ ] = [... 1
- Resistance of a given wire is obtained by measuring the current flowing in it and the voltage difference applied across it. If the percentage Correct option is A) 6% We know R = V over I thereforeΔ R over R = Δ V over V + Δ I over I Percentage error in R = Δ R over R × 100 = Δ V ov... 1
- The respective number of significant figures for the numbers 23.023, 0.0003 and 2.1 10–3 are Corret option is 1) 5,1,2 23.023 has 5 significant figures. 0.0003 has 1 significant figure. 2.1 × 10^(–3) has 2 significant figures. 1
- A body of mass m = 3.513 kg is moving along the x-axis with a speed of 5.00 ms−1. The magnitude of its momentum is recorded as Momentum, p = m × v = 3.513 × 5.00 = 17.565 kg m/s = 17.6 kg m/s Here number of significant digits in m is 4 and in v is 3, so, p must have... 1
- The dimension of magnetic field in M, L, T and C (coulomb) is given as Correct option is C) MT⁻¹C⁻¹ We know that, Lorentz force | overrightarrow F | = | qoverrightarrow v × overrightarrow B | therefore [B]=[F] o... 1
- Out of the following pair, which one does NOT have identical dimensions is A angular momentum and Planck's constant Correctt option is C) moment of inertia and moment of a force Moment of inertia, I = Mr² therefore [I] = [ML²] Moment of force, overrightarr... 1
- Which one of the following represents the correct dimensions of the coefficient of viscosity? option 1 is correct From stokes law, Viscous force F = 6π η rv ⇒ η = F over 6π rv therefore[η] = [MLT^(- 2)] over [L][LT^(- 1)] ⇒ [η] = [ML^... 1
- The physical quantities not having same dimensions are torque and work Correct option is 2) momentum and Planck's constant Momentum = mv = [MLT^(- 1)] Planck's constant, h = E over v=[ML²T^(- 2)] over [T^(- 1)]=... 1
- Dimensions of 1/u0E0 where symbols have their usual meaning, are Correct option is C ) [ L²T⁻² ] Explaination:: The velocity of light in vacuum is c = 1 over sqrt μ ₀ε ₀ therefore[1 over μ ₀ε ₀] = [c²] = [... 1
- let a=j-k and c=i-j-k. then the vector b satisfying ab+c=0 and a.b=3 is Option 1 is correct -i+j-2 k Explaination:: a x b + c = 0 a x (a x b) + a x c = 0 (a.b)a - (a.a)b + a x c = 0 3a - 2b + (-2i - j - k) = 0 2b... 1
- If u , v ,w are non-coplanar vectors and p,q are real numbers, then the equality Correct option is 3) exactly one value of (p,q) Explaination: 1
- Identify from the following the isoelectronic species: Ne, O2-, Na+ OR Ar, Cl2-, K⊕ Atoms and ions having the same number of electrons are isoelectronic Species and No. of electrons Ne =10 O²⁻ 8 + 2 = 10 Na⁺ 11 − 1 = 10 Ar 1... 1
- Give the names of quantum numbers. The four quantum numbers are principal quantum number (n), azimuthal or subsidiary quantum number (l), magnetic quantum number (m_l), and el... 1
- State Heisenberg uncertainty principle. Heisenberg's uncertainty principle states that “It is impossible to determine simultaneously, the exact position and exact momentum (or velo... 1
- Name the element that shows simplest emission spectrum. Hydrogen shows the simplest emmission spectrum 2
- If an element ‘X’ has mass number 11 and it has 6 neutrons, then write its representation. The representation of the given element is ¹¹₅X 1
- 4. Match the following : Element No. of Neutron a. ⁴⁰₁₈AR iv. 22 b. ¹⁴₆C iii. 8 c. ⁴⁰₁₉K ii. 21 d. ¹⁴₇N i. 7 1
- Complete the following information about the isotopes in the chart given below : Substance Mass Number Number of Protons Neutrons Electrons Carbon-14 14 6 8 6 Lead-208 208 82 126 82 Chlorine-35 35 17 18 17 Uranium-238 238... 1
- Make the pairs: neutrons six electrons Answer:: ‘A’ ‘B’ a. Neutrons iv. Chadwick b. p-orbital i. six electrons c. charge on electron ii. -1.6×10⁻¹⁹ C d. Lyman series iii. Ultravio... 1
- Principal Quantum number describes a. shape of orbital b) size of the orbital 2
- “No two electrons in the same atoms can have identical set of four quantum numbers”. This statement is known as - a. Pauli’s exclusion principle 2