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A parallel plate capacitor stores a charge Q at voltage V. Suppose the area of the capacitor and the distance between the plates are each doubled then which is the quantity that will change?

Given, the charge stored by the capacitor is Q and voltage is V. Let the capacitance of the capacitor is... View Article

Which gas is absorbed in turpentine oil?

Ozone is absorbed in turpentine oil due to its oxidizing property.The properties of ozone and oxygen molecules are entirely different.... View Article

Current sensitivity of a galvanometer can be increased by decreasing?

The current flowing through the coil is proportional to the deflection, or angle of twist, of the suspension. The formula... View Article

A closed coil consists of 500 turns on a rectangular frame of the area 4.0cm2 and has a resistance of 500Ω . The coil is kept with its plane perpendicular to a uniform magnetic field of 0.2wb/m2 , the amount of charge flowing through the coil if it is turned over. (Rotate through 1800 ): –

Given parameters are: Number of turns n=500 area A = 4cm2 = 4×10−4m2 resistance R = 500Ω magnetic field B... View Article

Moment of inertia does not depend upon A. Angular velocity of the body B. Shape and size C. Mass D. Position of the axis of rotation

Answer: A. Angular velocity of the body Explanation The moment of inertia is the quantity that determines how much torque... View Article

A copper wire of diameter 1.6mm carries a current of 20A. Find the maximum magnitude of the magnetic field B due to this current.

By using the Biot-Savart law B = μ0NI/2R We can find a formula for current carrying straight wire to find... View Article

In which of the following ionization processes, the bond order has increased and the magnetic behaviour has changed? a) N2 to N₂⁺ b) C₂ to C₂⁺. c) NO to NO⁺ d) O2 to O₂⁺,

Answer: (c) Explanation Bond order is the number of chemical bonds between a pair of atoms. A) Bond order reduces... View Article

In a LR circuit, R=10Ωand L=2H. If an alternating voltage of 120V and 60Hz is connected in this circuit, then the value current flowing in it will be ____________A

By using Ohm’s law V=IR we can find the value of current flowing in the circuit Here we have the... View Article

The work done during the expansion of a gas from a volume of 4 dm3 to 6 dm3 against a constant external pressure of 3 atm is:

Work done during expansion of a gas is:- W = −P△V W = −P(Vfinal−Vinitial) W = −3(6−4) W = −6L... View Article

For a reaction N2(g) + 3H2 (g) → 2NH3 (g) identify dihydrogen (H2) as a limiting reagent

N2(g) + 3H2(g) → 2NH3(g) In the given reaction, 1 mol of N2 requires 3 moles of H2 for the... View Article

Maximum change in oxidation number of nitrogen is ________ .

Nitrogen is the 7th element in the periodic table. Its electronic configuration is given by, 7N=1s22s22p3 Nitrogen can have oxidation... View Article

Which of the following changes when a particle is moving with uniform velocity? a) Speed b) Velocity c) Acceleration d) Position vector

Answer: d) Position vector Explanation Acceleration =0, Velocity = Speed = constant As the position of particle changes with time... View Article

A mass of 10 kg is suspended vertically by a rope from the roof. When a horizontal force is applied on the rope at some point, the rope is deviated by an angle of 45∘ at the roof point. If the suspended mass is at equilibrium, the magnitude of the force is? (Assume g=10ms⁻²)

We are given a hanging mass that is pushed by a force at a certain angle. To compute this force... View Article

In a Wheatstone bridge if the battery and galvanometer are interchanged then the deflection in galvanometer will:
a) Change in previous direction b) No change c) Change in opposite direction d) None of these

Answer: (b) No Change Explanation There will be no change in deflection because the revised structure is still a wheat... View Article

The maximum value of the static friction is called limiting friction. (A) True (B) False (C) Ambiguous (D) Data insufficient

Answer: (A) True Explanation Friction is the force that prevents solid surfaces, fluid layers, and material components from sliding against... View Article

A non-conducting ring of radius R and mass m having charge q uniformly distributed over its circumference is placed on a rough horizontal surface. A vertical time-varying uniform magnetic field B=4t² is switched on at time t=0 . The coefficient of friction between the ring and the table, if the ring starts rotating at t=2s , is:

Let us consider the coefficient of friction to be μ . The ring is placed on a horizontal surface, while... View Article

Two plane mirrors are at right angles to each other. A man stands between them and combs his hair with his hair with his right hand. In how many of the images will he be seen using his right hand: A. 0 B. 1 C. 2 D. 3

Answer: B)1 Explanation Two plane mirrors are held at right angles, which implies they are inclined at a 90-degree angle,... View Article

A thin rod of length L is bent to form a semicircle. The mass of the rod is M. What will be the gravitational potential at the center of the circle?

The gravitational potential due to any point mass is given by the formula, ⇒ V = −GM/r, where M is... View Article

Gravity separation process is used for the concentration of ______. A) Calamine B) Hematite C) Chalcopyrites D) Bauxite

Answer: b) Hematite Explanation The gravity separation technique is used to concentrate ore, as we all know. The gravity separation... View Article

Which of the following compounds is most reactive towards nucleophilic addition reactions?

a) b) c) d) Answer: (b) Explanation Nucleophilic addition reactions are addition reactions that are triggered by a nucleophile, and... View Article

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