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How to get a Percentage?

Answer: In mathematics, a percentage is a number or ratio that can be expressed as a fraction of 100. If we have to calculate percent of a... View Article

An electron moves in a circular orbit with a uniform speed v. It produces a magnetic field B at the centre of the circle. The radius of the circle is proportional to_______

Answer: An electron moves in a circular orbit with a uniform speed v. It produces a magnetic field B at the centre of the circle. The radius of... View Article

How to Convert 256 in Binary?

Answer: (256)10 = (100000000)2 According to digital electronics and mathematics, a binary number is defined as a number that is expressed in the... View Article

Formic acid and acetic acid are distinguished by (1) NaHCO3 (2) FeCl3 (3) Victor Mayer test (4) Tollen’s reagent

Answer:(4) Tollen's reagent The aldehyde group is present in formic acid. It, like other aldehydes, reduces Tollen's reagent to silver mirror.... View Article

The earth behaves as a magnet with magnetic field pointing approximately from the geographic (1) North to South (2) South to North (3) East to West (4) West to East

Answer: (2) South to North At the North pole and the South pole, a bar magnet will point vertically because the magnetic north pole and the... View Article

The increasing order of reducing power of the halogen acids is (1) HF < HCI < HBr < HI (2) HI < HBr < HCI < HF (3) HBr < HCI < HF < HI (4) HCI < HBr < HF < HI

Answer: (1) HF < HCI < HBr < HI As the size of the halogen atom increases, the binding strength of the H-X bond decreases, increasing... View Article

Diagonal relationship is not shown by (1) Li and Mg (2) Be and Al (3) B and Si (4) C and P

Answer: (4) C and P A diagonal relationship in S block elements exists between adjacent elements which are located in the second and third... View Article

The internal energy of an ideal gas depends upon (1) only its pressure (2) only its volume (3) only its temperature (4) its pressure and volume

Answer: (3) only its temperature In ideal gases, intermolecular forces are supposed to be absent, and collisions are entirely elastic. To... View Article

For what value of x the matrix A is singular

Answer: A matrix is an ordered arrangement of rectangular arrays of function or numbers, that are written in between the square brackets.... View Article

A water pump driven by petrol raises water at a rate of 0.5m³/minute from a depth of 30m. If the pump is 70% efficient, then power developed by the engine is (1) 1750W (2) 2450W (3) 3500W (4) None of these

Answer: (3) 3500W η = Po/Pi Where η = Efficiency of the engine Po = Output power Pi = Input power Pi = Po/η... View Article

What is the LCM of 24 and 90?

Answer: In Mathematics, LCM(Least Common Multiple) of any two is the value which is evenly divisible by the two given numbers. LCM is a method... View Article

The electric flux from a cube of edge l is ϕ. If an edge of the cube is made 2l and the charge enclosed is halved, its value will be (1) 4ϕ (2) 2ϕ (3) ϕ/2 (4) ϕ

The electric flux from a cube of edge l is ϕ. If an edge of the cube is made 2l and the charge enclosed is halved, its value will be (1) 4ϕ (2)... View Article

The angular shape of ozone molecule (O₃) consists of (1) sigma and 2 pi bonds (2) sigma and 2 pi bonds (3) 1 sigma and 1 pi bonds (4) 2 sigma and 1 pi bonds

Answer: (4) 2 sigma and 1 pi bonds Ozone (O3) an unstable, blue, diamagnetic gas with a characteristic pungent odor, protects the earth and its... View Article

The average weight of 8 persons increases by 2.5 kg when a new person comes in place of one of them weighing 65 kg. What might be the weight of the new person (1) 76Kg (2) 85Kg (3) 76.5Kg (4) Data inadequate

Answer: (2) 85Kg Given: Total number of person = 8 Increased in average weight = 2.5 kg Total weight increased = 8 × 2.5kg = 20kg... View Article

With rise in temperature the electrical conductivity of intrinsic semiconductor: (1) Increases (2) Decreases (3) First increases and then decreases (4) First decreases and then increases

With rise in temperature the electrical conductivity of intrinsic semiconductor: (1) Increases (2) Decreases (3) First increases and then... View Article

Water falls from a tap, down the streamline (1) Area decreases (2) Area increases (3) Velocity remains same (4) Area remains same

Answer: (1) Area decreases As per the equation of continuity Constant = Area (A) × Velocity(V) ∴ When velocity increases, area... View Article

How to do long division?

Answer: Long Division is a method for dividing large numbers that divides the task into numerous phases that must be completed in a specific... View Article

A potentiometer consists of a wire of length 4m and resistance 10Ω. It is connected to a cell of EMF 3V. The potential gradient of wire is (1) 0.75 V/m (2) 2 V/m (3) 6 V/m (4) 10 V/m

A potentiometer consists of a wire of length 4m and resistance 10Ω. It is connected to a cell of EMF 3V. The potential gradient of wire is... View Article

In an AP, the p^th term is q and (p+q)^th term is 0. Show that its q^th term is p.

Answer: Let the First term = a Common difference of the given A.P. = d ap = q ⇒ a + (p-1)d = q __________(1) a = q - (p - 1) d a... View Article

What is the Formula of Biot-Savart’s Law?

Answer: Biot-Savart’s law is an equation that gives the magnetic field produced due to a current carrying segment. This segment is taken... View Article

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