Physics-
General
Easy
Question
A steel rod of dimensions 
is tightly fixed between two supports and is not allowed to expand. It is heated through 
. Thermal stress developed is 
- 7.2
- 2.7
- 3.6
- 0.72
The correct answer is: 7.2
Related Questions to study
physics-
Coefficient of cubical expansion of a solid is 
If the temperature is measured on Fahreheit scale, numerical value of coefficient of linear expansion of solid is
Coefficient of cubical expansion of a solid is If the temperature is measured on Fahreheit scale, numerical value of coefficient of linear expansion of solid is
physics-General
physics-
A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is 4/3 and the fish is 12 cm below the surface of water, the radius of the circle in centimeter is
A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is 4/3 and the fish is 12 cm below the surface of water, the radius of the circle in centimeter is
physics-General
physics-
Consider the situation shown in figure. Water (mw = 4/3) is filled in a beaker upto a height of 10 cm. A plane mirror is fixed at a height of 5 cm from the surface of water. Distance of image from the mirror after reflection from the mirror after reflection from it of an object O at the bottom of the beaker is
Consider the situation shown in figure. Water (mw = 4/3) is filled in a beaker upto a height of 10 cm. A plane mirror is fixed at a height of 5 cm from the surface of water. Distance of image from the mirror after reflection from the mirror after reflection from it of an object O at the bottom of the beaker is
physics-General
physics-
One side of a glass slab is silvered as shown in figure. A ray of light is incident on the other side at angle of incidence i = 45º. Refractive index of glass is given as 1.5. The deviation of the ray of light from its initial path when it comes out of the slab is
One side of a glass slab is silvered as shown in figure. A ray of light is incident on the other side at angle of incidence i = 45º. Refractive index of glass is given as 1.5. The deviation of the ray of light from its initial path when it comes out of the slab is
physics-General
Physics-
On a hypothetical scale X, the ice point is 40° and the steam point is 120° For another scale Y the ice point and steam points are 30°
On a hypothetical scale X, the ice point is 40° and the steam point is 120° For another scale Y the ice point and steam points are 30°
Physics-General
Physics-
Express 0K on Fahrenheit scale.
Express 0K on Fahrenheit scale.
Physics-General
physics-
A uniform ladder of length 5 m is placed against the wall as shown in the figure. If coefficient of friction 
is the same for both the walls, what is the minimum value of m for it not to slip?
A uniform ladder of length 5 m is placed against the wall as shown in the figure. If coefficient of friction is the same for both the walls, what is the minimum value of m for it not to slip?
physics-General
physics-
Two light vertical springs with equal natural lengths and spring constants 
and 
are separated by a distance l. Their upper ends are fixed to the ceiling and their lower ends to the ends A and B of a light horizontal rod AB. A vertical downward force F is applied at point C on the rod. AB will remain horizontal in equilibrium if the distance AC is
Two light vertical springs with equal natural lengths and spring constants and are separated by a distance l. Their upper ends are fixed to the ceiling and their lower ends to the ends A and B of a light horizontal rod AB. A vertical downward force F is applied at point C on the rod. AB will remain horizontal in equilibrium if the distance AC is
physics-General
Physics-
The spool shown in fig is placed on a rough horizontal surface and has inner radius 
and outer radius R. The angle 
between the applied force and the horizontal can be varied. The critical angle 
for which the spool does not roll and remains stationary is given by:
The spool shown in fig is placed on a rough horizontal surface and has inner radius and outer radius R. The angle between the applied force and the horizontal can be varied. The critical angle for which the spool does not roll and remains stationary is given by:
Physics-General
physics-
Find minimum height of the obstacle so that the sphere can stay in equilibrium.
Find minimum height of the obstacle so that the sphere can stay in equilibrium.
physics-General
physics-
Two halves of a round homogeneous cylinder are held together by a thread wrapped round the cylinder with two equal weights. The complete cylinder weighs 31.4 kg. The plane of contact of both of its halves is vertical. For equilibrium of both haves of the cylinder, the minimum value of m is
Two halves of a round homogeneous cylinder are held together by a thread wrapped round the cylinder with two equal weights. The complete cylinder weighs 31.4 kg. The plane of contact of both of its halves is vertical. For equilibrium of both haves of the cylinder, the minimum value of m is
physics-General
physics-
An unstretched massless rope is wrapped around a solid cylinder of mass and radius of the rope is fixed while cylinder is released from rest. The acceleration of the rope is
An unstretched massless rope is wrapped around a solid cylinder of mass and radius of the rope is fixed while cylinder is released from rest. The acceleration of the rope is
physics-General
physics-
A hollow sphere is released from the top of a wedge as shown in the figure. There is no friction between the wedge and the ground. There is sufficient friction to provide pure rolling of the sphere. The velocity of the sphere with respect to ground just before it leaves the wedge will be [Assume masses of the wedge and sphere are equal, h>>R the radius of sphere and the portion of wedge where the sphere leaves the wedge is horizontal]
A hollow sphere is released from the top of a wedge as shown in the figure. There is no friction between the wedge and the ground. There is sufficient friction to provide pure rolling of the sphere. The velocity of the sphere with respect to ground just before it leaves the wedge will be [Assume masses of the wedge and sphere are equal, h>>R the radius of sphere and the portion of wedge where the sphere leaves the wedge is horizontal]
physics-General
Physics-
A non homogenous solid cylinder of radius r is placed on a rough inclined plane of angle of inclination 60° The angle of repose corresponds to 30°. The maximum radius of gyration in order to prevent slipping is :
A non homogenous solid cylinder of radius r is placed on a rough inclined plane of angle of inclination 60° The angle of repose corresponds to 30°. The maximum radius of gyration in order to prevent slipping is :
Physics-General
physics-
Four solid spheres P, Q, R and S are made to move on a horizontal surface which is rough enough. Sphere P is given a spin and released sphere Q is given a linear velocity and released ; sphere R is given a reverse spin and a forward linear velocity and released ; sphere S is given a forward spin and a forward linear velocity as shown in figure the direction of frictional force F for P, Q, R and S will be along
Four solid spheres P, Q, R and S are made to move on a horizontal surface which is rough enough. Sphere P is given a spin and released sphere Q is given a linear velocity and released ; sphere R is given a reverse spin and a forward linear velocity and released ; sphere S is given a forward spin and a forward linear velocity as shown in figure the direction of frictional force F for P, Q, R and S will be along
physics-General
