All questions
- Q 1. Rewrite the correct statement : (1) The temperature range helps the wind in its work. Question 1: Correct. Question 2 : Incorrect. Work of wind is more prominent in desert regions than other agents of erosion. Question 3 : Cor... 1
- Exogenetic Processes std 9th maharashtra board notes . Many landforms are formed due to the internal movements. Many processes occurring on the earth’s surface also lead to the formation or degra... 1
- See the given pictures. Observe the physical appearance of the rocks in each picture. You can see that rocks are broken At some places the day temperatures are very high and the night temperatures are very low. In the given pictures the rocks may have broken d... 1
- Identify the type of weathering from the given description. (a) Some animals live inside the grounds by making (a) Biological weathering (b) Chemical weathering (c) Mechanical weathering (d) Mechanical weathering (e) Mechanical weathering 1
- Complete the flowchart below. Weathering process Chemical weathering Exfoliation Oxidation Burrowing by animals Complete the flowchart below. Weathering process Chemical weathering Exfoliation Oxidation Burrowing by animals 2
- Write whether the statements are true or false. Correct the incorrect ones. (a) Climate affects earthquakes. Answer: False – Internal movements affect (leads to) earthquakes. (b) Mechanical weathering is less effecti... 1
- Distinguish between weathering and mass wasting. Weathering Breaking or weakening of rocks is called as weathering. Weathering is of three types – Mechanical, Chemical and Biological. Mass... 1
- How does biological weathering occur? The weathering caused by living organisms is called biological weathering It is the process by which rocks are broken into small fragments a... 1
- What are the main types of chemical weathering? The process of decomposition of rocks due to changes in their chemical composition is called chemical weathering. Its main types are: (i) Ca... 1
- What is mechanical weathering? The disintegration of rocks without any change in their chemical composition is called mechanical weathering. The minerals in the rocks expa... 1
- The electric field in a region is given by with vector E = 2/5 E0 i + 3/5 E0 j with E0 = 4.0 × 10^3 N/C Answer is 640 ɸ = Ex A ⇒ 2/5 x 4 x 103 x 0.4 = 640 1
- Suppose you have taken a dilute solution of oleic acid in such a way that its concentration becomes 0.01 cm3 correct Answer is 25 2
- A boy of mass 4 kg is standing on a piece of wood having mass 5kg Answer is 30 N + T = 90 T = μ N = 0.5 (90–T) 1.5 T = 45 T = 30 1
- A body of mass 1 kg rests on a horizontal floor with which it has a coefficient of static friction \(\frac 1{\sqrt3}\) Correct answer is 5 1
- The electric field intensity produced by the radiation coming from a 100 W bulb at a distance of 3m is E . Answer is 3 1
- A sphere of mass 2kg and radius 0.5 m is rolling with an initial speed of 1 ms–1 goes up an Correct option is (3) 0.57 s a=gsin θ/1+I/mR² 5/7×10/2 =25/7 t=2v₀/a=2×1×7/25 =0.56 s 1
- What happens to the inductive reactance and the current in a purely inductive circuit if the frequency is halved ? Correct option is (2) Inductive reactance will be halved and current will be doubled. X_L=ω L i=V₀/ω l 1
- Figure shows 2 views of casting , Draw an isometric view with suitable origin Figure shows 2 views of casting , Draw an isometric view with suitable origin 1
- What is diffraction and its types? Diffraction of light is the phenomenon of bending of light around the corners of the small obstacles and hence its encroachment in the regio... 1
- A step index fiber has a core diameter of 29 x10-6 m. the refractive indices of core and cladding Answer: normalised frequency V ≈ 4.05 . V = 2π a/λsqrtn₁² - n₂² Core radius a = dfrac29×10⁻⁶2 = 14.5×10⁻⁶\ m , λ = 1.3×10⁻⁶\ m . Numerical a... 1
- Derive Gauss law for static electric and magnetic field in differential and integral form Answer: for the electric field, ointvec E· dvec A = q/ε₀ (integral form) and nabla·vec E = ρ/ε₀ (differential form). For the magnetic field,... 1
- What is the highest order spectrum, which may be seen with monochromatic light of wavelength 6000 Answer: the 3rd order. Grating element: (e+d) = 1/5000\ cm = 2×10⁻⁴\ cm = 2×10⁻⁶\ m Grating equation: (e+d)sinθ = nλ . The largest possible... 1
- Explain the concept of time dilation and deduce an expression for it. A particle moving with a speed of 0.7c. Answer: a moving clock runs slow: Δ t = dfracΔ t₀sqrt1 - v²/c² . For a particle at 0.7c, rest mass : moving mass = √(1-0.49) ≈ 0.714 , i.e.... 1
- Explain the construction and working of a Transmission Electron microscope with a schematic diagram