A force of 20 N acts on a body and displaces it 2m along the direction of force. Then the work done by the force is:
Work done is defined as force into displacement Work done = F × S Cosθ Where F is the force... View Article
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When the temperature of a substance increases, what happens to the speed of the molecules?
When the temperature is increased, the supplied energy excites the molecules, thus increasing their speed.
Unit of latent heat is____
Answer: The unit of latent heat is joule. The heat needed to transform a solid into a liquid or vapour phase,... View Article
If the m mass of the substance undergoes a change from one state to another, then the amount of heat required for the process is
If the m mass of the substance undergoes a change from one state to another, then the amount of heat... View Article
A molecule which has no net dipole moment is called
A molecule which has no net dipole moment is called non-polar. In non-polar molecule, the centres of positive and negative... View Article
Dimensional formula of stress is same as that of
Both stress & pressure are defined as force per unit area
The modulus of elasticity of steel is greater than that of rubber because under the same stress
Modulus of elasticity is inversely proportional to strain for a given stress. If steel and rubber are under the same... View Article
What is modulus of rigidity?
The modulus of rigidity is defined as the ratio of tangential stress to shear strain. Modulus of rigidity Shear Modulus... View Article
Time rate at which work is done by a force is
Time rate at which work is done by a force is Power.
What is the relationship between joule and erg?
Joule is the SI unit of energy while erg is the cgs unit of energy. 1 Joule of Energy =... View Article
Two vectors are equal if and only if
Vectors are characterized by the magnitude as well as direction.
A uniformly polarized dielectric amounts to induced ______ charge density but no ______charge density.
As charges are separated on the surface of the dielectric but not in its interior volume.
If the temperature difference between the body and surrounding is small, then the rate of loss of heat is directly proportional to
If the temperature difference between the body and surrounding is small, then rate of loss of heat is directly proportional... View Article
Constant speed along a horizontal circular path
A cart moves with a constant speed along a horizontal circular path. From the cart, a particle is thrown up... View Article
Rate of conduction of heat depends on:
Rate of conduction of heat depends on a. Area of cross section b. Temperature difference
Magnitude of resultant of two vectors, A and B is given by square root of:
Magnitude of resultant of two vectors, A and B is given by square root of A2 + B2 + 2AB... View Article
Which is the fastest mode of heat transfer?
A) Radiation B) Conduction C) Convection D) None of the above The correct option is A) Radiation. Radiation is the... View Article
Newton’s law of cooling states that the rate of cooling of a body is proportional to the _____________________.
Newton’s law of cooling states that the rate of cooling of a body is proportional to the excess temperature of... View Article
Which of the following is the vector quantity?
Where, gravitational constant-g is a vector quantity. The product of vector and scalar is also a vector. Thus, the weight... View Article
Which of the following forces is responsible for elastic behavior of a substance?
Restoring force is responsible for the elastic behavior of substance.
