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A system is provided with 50 Joules of heat and the work done on the system is 10 joules. What is the change in the internal energy of the system in Joules?

A system is provided with 50 Joules of heat and the work done on the system is 10 joules. What is the change in the internal energy of the system... View Article

A piece of ice falls from a height h so that t melts completely. Only one-quarter of the heat produced is absorbed b the ice, and all energy of ice gets converted into heat during its fall. The value of h is?

A piece of ice falls from a height h so that t melts completely. Only one-quarter of the heat produced is absorbed b the ice, and all energy of... View Article

Force between two identical short bar magnets whose centres are r metre apart is 4.8 N when their axes are in the same line. If the separation is increased to 2r metre, the force between them is reduced to?

Given, Two bar magnets placed axially at distance r Force between them = 4.8N Solution: Force between two magnetic dipoles is = F... View Article

A dye absorbs a photon of wavelength λ and re-emits the same energy into two photons of wavelength λ1 and λ2 respectively. The wavelength λ is related to λ1 and λ2 as?

Let E be the energy of a photon with wavelength λ E1 be the energy of a photon with wavelength λ1 E2 be the energy of a... View Article

The kinetic energy needed to project a body of mass m from the earth surface to infinity is? (1) mgR/2 (2) mgR/4 (3) mgR (4) 2mgR

Answer: (3) mgR Kinetic energy of an object is the measure of the work an object can do by virtue of its motion. The kinetic energy equation is... View Article

If 2a=3b=4c, then a:b:c?

Given: 2a=3b=4c Dividing both sides with LCM of 2,3,4 which is 12, we get, a/6=b/4=c/3 Therefore, a:b:c = 6:4:3... View Article

Left shift of oxyhaemoglobin curve is noticed under

Left shift of oxyhaemoglobin curve is noticed under? normal temperature and pH low temperature and high pH low pH and low temperature low... View Article

A stream of electrons from a heated filament was passed between two charged plates kept at a potential difference V esu. If e and m are charge and mass of an electron, respectively, then the value of h/λ is given as?

Kinetic energy = eV = 1/2mu2 u = √2eV/m eq.1 Where u is the velocity of the electrons From de Broglie... View Article

In a uniform magnetic field of induction B a wire in the form of a semicircle of radius r rotates about the diameter of the circle with angular frequency ω. The axis of rotation is perpendicular to the field. If the total resistance of the circuit is R the mean power generated per period of rotation is?

Answer: Uniform magnetic field of induction = B Radius = r Frequency = ω The axis of rotation is perpendicular to the field Total... View Article

A block of mass 2 kg is on a horizontal surface. The coefficient of static and kinetic friction are 0.6 and 0.2. The minimum horizontal force required to start the motion is applied and if it is continued, the velocity acquired by the body at the end of the 2nd second is?

A block of mass 2 kg is on a horizontal surface. The coefficient of static and kinetic friction are 0.6 and 0.2. The minimum horizontal force... View Article

Hirudin is

Hirudin is? an antibiotic produced by a genetically engineered Escherichia coli a lysine-rich protein produced by Hordeum vulgare an... View Article

Energy required to move a body of mass m from an orbit of radius 2R to 3R is?

Energy required to move a body of mass m from an orbit of radius 2R to 3R is? GMm/12R2 GMm/6R GMm/8R... View Article

Which of the following is a molecular solid

Which of the following is a molecular solid? ice graphite diamond quartz The correct option is i. ice... View Article

Two spherical conductors A and B of radii 1 mm and 2 mm separated by a distance of 5 cm and are uniformly charged. If the spheres are connected by a conducting wire then in equilibrium condition, the ratio of the magnitude of the electric fields at the surfaces of spheres a and B is?

After connection, V1=V2 K(Q1/r1)=K(Q2/r2) Q1/r1=Q2/r2 The ratio of electric fields is E1/E2 = E1/E2 = E1/E2 = E1/E2... View Article

A car turns a corner on a slippery road at a constant speed of 12 m/s. If the coefficient of friction is 0.4, the minimum radius of the arc in meters in which the car turns is?

A car turns a corner on a slippery road at a constant speed of 12 m/s. If the coefficient of friction is 0.4, the minimum radius of the arc in... View Article

A group of atoms carrying a charge is known as a

A group of atoms carrying a charge is known as a polyatomic ion.... View Article

Calculate frequency and wave-number of yellow radiation having wavelength 5800Å.

Wavelength of light = 5800x10-10 m Frequency = C/wavelength =... View Article

The pitch of a screw gauge is 0.5 mm and there are 100 divisions on its circular scale. The instrument reads +2 divisions when nothing is put in between its jaws. In measuring the diameter of a wire, there are 8 divisions on the main scale and 83 division coincide with reference line, then diameter of the wire is?

The pitch of a screw gauge is 0.5 mm and there are 100 divisions on its circular scale. The instrument reads +2 divisions when nothing is put in... View Article

The decreasing order of acidity of following phenol derivatives is

The decreasing order of acidity of the following phenol derivative is? P>Q>R>S S>R>P>Q S>R>Q>P Q>S>R>P... View Article

What is a glycosidic linkage

Glycosidic linkages are used for glycosidic bonds. These bonds are the covalent bonds that are formed between either a sugar molecule or a... View Article

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