The approximate depth of an ocean is 2700 m.The compressibility of water is 45.4 x 10^{-11} Pa^{-1} and density of water is 10^{3} kg/m^{3}. What obtained at the bottom of the ocean?
0.8 x10^{-2}
1.0 x 10^{-2}
1.2 x 10^{-2}
1.2 x 10^{-2}
Copper of fixed volume V is drawn into wire of length l. When this wire is subjected to a constant force F, the extension produced in the wire is . Which of the following graphs is a straight line?
The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied?
Length = 50 cm, diameter = 0.5 mm
Length = 100 cm, diameter = 1 mm
Length = 200 cm, diameter = 2 mm
Length = 200 cm, diameter = 2 mm
Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is r, Now the strings are rigidly clamped at half the height. The equilibrium separation between the balls now become.
The young's modulus of steel is twice that of brass. Two wires of same length and of same area of cross section, one of steel and another of brass are suspended from the same roof. we want the lower ends of the wires to be at the same level, then the weight added to the steel and brass wires must be in the ratio of
1:2
2:1
4:1
4:1
The solid cylinder and a hollow cylinder, both of the same mass and same external diameter are released from the same height at the same time on a inclinded plane. Both roll down without slipping which one will reach the bottom first?
Both together only when angle of inclination of plane is 45^{o}
Both together
Hollow cylinder
Hollow cylinder
Sodium has body centred packing.Distance between two nearest atoms is 3.7 A. The lattice parameter is
6.8 A
4.3 A
3.0 A
3.0 A
For a cubic structure which one of the following relations indicating the cell characteristic is correct?
The bulk modulus of a spherical object is ‘B’. If it is subjected to uniform pressure ‘p’, the fractional decrease in radius is
p/B
B/2p
3p/B
3p/B
A rope is wound around a hollow cylinder of mass 3 kg and radius 40 cm. What is the angular acceleration of the cylinder if the rope is pulled with a force of 30 N?
25 m/s^{2}
0.25 rad/s^{2}
25 rad/s^{2}
25 rad/s^{2}
C.
25 rad/s^{2}
τ = I α
F × R = MR^{2}α
30 × 0.4 = 3 × (0.4)^{2}^{} α
12 = 3 × 0.16 α
400 = 16 α
α = 25 rad/s2