Doubtly
@Doubtly · Joined Feb 2021
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- Distinguish between accuracy and precision. Accuracy Precision Accuracy refers to nearness of the measured value to the true value. Precision refers to closeness of multiple readings o... 1
- What do you mean by significant figures? State the rules for deciding significant figures The significant figures in measurement or result are the number of digits known with certainty plus one uncertain digit. Rules for deciding... 1
- Define : Least count The smallest value that can be measured by the measuring instrument is called its least count. 2
- The magnetic flux linked with a coil (in Wb) is given by the equation ϕ = 5t^2 + 3t + 16 The magnitude of induced Given: Magnetic flux (ϕ) = 5t²+ 3t + 16 induced emf = -dφ/dt ε = d(5t²+3t+16/dt =10t+3 Therefore induced e.m.f. , when t=3, |ε₃|=(10×3)+3=33... 1
- A beam of protons with speed 4 × 105 ms–1 enters a uniform magnetic field of 0.3T at an angle of 60º Correct answer is option 3) 4cm Explaination:: Pitch=(Vcosθ)T =(Vcosθ)2π m/eB =(4×10⁵cos60°)2πover0.3×10(1.67×10⁻²⁷over1.69×10¹⁹) = 4cm 1
- In a Young's double slit experiment, light of 500 nm is used to produce an interference pattern. β_(0 )= λ/d = 500 x 10⁻⁹/5 x 10⁻⁵ = 10^(-2 )Radian = 0.57º 2
- Endothermic reaction Endothermic reaction: In endothermic reaction, heat is either absorbed from the surroundings or heat has to supplied from outside. It means... 1
- e. Explain the similarity and difference in two events, namely adding NaOH to water and adding CaO to water. Chemical equations involved: 1) Reaction between NaOH and water NaOH(s)+H2O(l)->Na^+_((aq)) + OH^-_((aq)) + triangle (HEAT) 2) Reaction betw... 1
- d. Explain the types of reaction with reference to oxygen and hydrogen. Illustrate with examples. There are main three types of chemical reactions with reference to oxygen and hydrogen: 1.Combination Reaction 2. Decomposition Reaction 3.... 1
- c. Explain the term reactant and product giving examples. Reactants:- The substances which take part in a chemical reaction are called reactants. Products:-The substances which are formed due to the... 2
- b. How can the rate of the chemical reaction, namely, decomposition of hydrogen peroxide be increased? The rate of chemical reaction can be increased by using catalysts. In hydrogen peroxide decomposition, (Manganese dioxide powder)MnO₂ is use... 1
- a. What is the reaction called when oxidation and reduction take place simultaneously? When oxidation and reduction takes place simultaneously, the reaction is called redox reaction. Oxidation: losing of electrons Reduction: ga... 1
- 1. Choose the correct option from the bracket and explain the statement giving reason. (Oxidation, displacement a. To prevent rusting, a layer of zinc metal is applied on iron sheets. Reason :: In this method, a thin layer of zinc is applied on iron sh... 1
- A plano-convex lens of unknown material and unknown focal length is given. (3) radius of curvature of the curved surface https://youtu.be/694XzGd_gpY This video content does not belong to Brainiak for instant remova... 1
- std 10th maharashtra board science part 1 Chapter 2: Periodic Classification of Element notes Download pdf for offline study 1
- 8. Write the names from the description. a. The period with electrons in the shellsK, L and M. b. The group with valency zero. c. The family of nonmetals 8. Write the names from the description. a. The period with electrons in the shells K, L and M. ⇒ Third period b. The group with valency zer... 1
- e. The third period contains only eight elements even through the electron capacity of the third shell is 18 . i) The number of elements in the first three periods depends on the electron capacity of the shells and the law of electron octet. ii. The e... 1
- d. Elements belonging to the same group have the same valency. i. The electronic configuration of the outermost shell is same for all the elements belonging to the same group. ii. So, the number of valen... 1