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The moment of a magnet (15cm×2cm×1cm) is 1.2Am₂. What is its intensity of magnetisation?

The electrons circulating around the nucleus have a magnetic moment. When the material is not magnetised the magnetic dipole moment... View Article

A galvanometer with resistance 100 Ω gives full scale deflection with a current of 10 mA. The value of shunt, in order to convert it into an ammeter of 10 ampere range, will be

A galvanometer is a device that is used to detect a small electric current or measure its magnitude. The current... View Article

A charge Q is placed at the centre of the line joining two point charges +q and +q as shown in figure. The ratio of charges Q and q is

For the equilibrium of charge Q, the force applied by both the charges i.e. another Q and q should be equal in magnitude and opposite... View Article

A dipole is placed parallel to the electric field. If W is the work done in rotating the dipole by 60, then the work done in rotating it by 180º is

A dipole is placed parallel to the electric field. If W is the work done in rotating the dipole by... View Article

A current i ampere flows along an infinitely long straight thin walled tube, then the magnetic induction at any point inside the tube is_______

A current i ampere flows along an infinitely long straight thin-walled tube, then the magnetic induction at any point inside... View Article

The transformer is used to light 100 W –110 V lamps from 220 V mains. If the main current is 0.5 A, the efficiency of the transformer is a. 90% b. 95% c. 96% d. 99%

The correct answer is a. 90% Solution P=VI Comparing system output with input will confirm transformer efficiency. The system is called better when its efficiency is high. \(\begin{array}{l}Efficiency\left... View Article

The flux linked with a coil at any instant ‘t’ is given by ϕ=10t²−50t+250. The induced emf at t=3s is

Given According to the given data ϕ=10t2−50t+250. t=3s Find out We have to determine the induced emf at the given... View Article

The potential difference V_A−V_Bbetween points, A and B for the circuit segment shown in the figure at the given instant is

Given As per the given diagram We get to know that the current in the circuit is I=3A Find out We... View Article

A particle executes SHM with amplitude 0.4 m and time period 24 s. The distance travelled by the particle in 10 s is (initially particle is at its mean position)

Given: According to the given data Amplitude = 0.4 m Time period = 24 s. Find out We have to determine the... View Article

Assertion: Mass of a body decreases slightly when it is negatively charged. Reason: Charging is due to the transfer of electrons. (A) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion (B) Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion (C) Assertion is correct but Reason is incorrect (D) Assertion is incorrect but Reason is correct

The correct answer is an option (D) Assertion is incorrect but the Reason is correct If a body has an excess... View Article

Determine the period of small oscillations of the block of mass m as shown in the figure (The springs are ideal and pulleys are massless?)

A point mass M is suspended from the end of a light inextensible string whose upper end is fixed to... View Article

What are Consumer Forums? What is their importance?

Answer: Consumer forums are voluntary organisations. Consumer forums will help consumers to file cases in consumer courts. Consumer forums are... View Article

Describe the Evolution of Consumer Movement in India.

Answer: Due to shortage of food, hoarding, black marketing, adulteration of edible oil and food, there was rampant exploitation of... View Article

What is an allegory? Give an example of allegory.

Answer: An allegory has a symbolic and literal meaning. When an abstract idea such as liberty, freedom, envy, greed is... View Article

A river with an inflow of domestic sewage rich in organic waste may result in a) Death of fish due to lack of oxygen b) An increased production of fish due to biodegradable nutrients c) Increased population of aquatic food web organisms d) The river will dry up very soon due to the algal bloom.

Answer: The correct answer is option (a) – Death of fish due to lack of oxygen. The dissolved oxygen will... View Article

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