Doubtly
@Doubtly · Joined Feb 2021
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- In a CGS system of units , the density of a material is 4 g cm^-3 . what will be the value of the density of the material Correct option is C) 40 1
- in a new system of units , the unit of force is 100 N , unit of length is 10 m and unit of time is 100s , unit of mass in this system can be expressed as Correct option is A) 10⁵kg Substituting value of L and T from equation 2 and 3 in eq 1 we get 1
- The accuracy in the measurement of time for 20 oscillations of a pendulum for the following measurement correct option is A)±0.2s 1
- The potential difference across a resistor is measured to be V=(8±0.5) V and current Correct option is A) 4±16.25% 1
- If The Unit Of Mass, Length And Time Are Doubled,unit Of Angular Momentum Will Be Correct answer is option C) Quadrupled hence , unit of angular momentumn is quadrupled 1
- Maharashtra SSC Model Question Paper 2021 PDF Links Maharashtra SSC Model Question Paper 2021 PDF Links Maharashtra Board Class 10 all subjects sample paper is a fruitful resource, which invol... 1
- [Algebra] Maharashtra Board Maths part 1 previous year paper march 2020 Maharashtra Board Maths previous year paper march 2020 To view online View To download for offline study download link For study now 1
- If α, β and γ are three consecutive terms of a non-constant G.P. such that the equations Correct option is 4) βγ α x² + 2β x + γ = 0 Let β = α t, γ = α t² therefore α x² + 2α tx + α t² = 0 ⇒ x² + 2tx + t² = 0 ⇒ (x + t)² = 0 ⇒ x =... 1
- The Boolean expression ∼(p⇒(∼q)) is equivalent to : Correct option is A) p^q Explaination:: ∼(p⇒(∼q)) as p⇒q \ is \ same \ as \ ∼p v q we get ∼((∼p) v(∼q)) = p^q 1
- A triangle has a vertex at (1, 2) and the mid points of the two sides through it are (-1, 1) and (2, 3). Then the centroid of this triangle is: Correct option is 2) ( 1/3,rm 2 ) Explanation:: 1
- A plane which bisects the angle between the two given planes 2x – y + 2z – 4 = 0 and x + 2y + 2z – 2 = 0, passes through the point :0 Correct option is (4) (2, –4, 1) Explaination:: From question, the equations of planes given are: 2x – y + 2z – 4 = 0 X + 2y + 2z – 2 = 0 Th... 1
- The equation of the common tangent to the curves y^2 = 16x and xy = - 4 is Answer: (a) x - y + 4 = 0 Any tangent to the parabola y² = 16x (here 4a = 16 , so a = 4 ) with slope m is y = mx + 4/m For it to touch the h... 1
- The equation of the common tangent to the curves y^2 = 8x and xy = - 1 is Correct option is (d) y=x+2 Explaination:: tangents to the curve y²=8x is y=mx+2/m , so it must satisfy xy=-1 x(mx+2/m)=-1 mx²+2/mx+1=0 , si... 1
- The general solution of the differential equation (y^2 – x^3 )dx – xydy = 0 (x ≠ 0) is : The correct option is 2) y²+2x³+cx²=0 Detailed explaination 1
- Let a ∈ (0,π/2) be fixed. If the integral ∫ tan x + tan α/tan x - tan α dx = A(x) cos 2α + B(x) sin 2α + C, where C is a Correct option is (4) x – α and log_e|sin(x – α)| Detailed Explaination: ∫ tan x + tan α/tan x - tan α dx = ∫ sin x /cos x+ sin α/cos α/sin... 1
- A coil of inductance 300 mH and resistance 2 is connected to a source of voltage 2 V. Correct answer is option d) 0.1 s Explaination: During growth of charge in an inductance, I = I₀ (1 – e ^(–Rt/L)) or I₀/2 = I₀(1 – e^( –Rt/L... 1
- When current in a coil changes from 5 A to 2 A in 0.1 s, an average voltage of 50 V is produced Correct option is 2) 1.67H Explaination EMF = L × di/dt 50 = L × (5-2)/0.1 = L × 30 L = 5/3 = 1.67 1
- A rectangular loop is present in the magnetic field region of an infinite long wire. Now the loop is being rotated as shown in the figure. option B is correct 1