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Physics

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A sphere of mass M and radius

A sphere of mass M and radius R2 has a concentric cavity of radius R1 as shown in figure. The...

The diagram showing the variation of gravitational potential of earth with distance from the centre of earth is

Answer: c (26)

Assuming the earth to have a constant density, point out which of the following curves show the variation of acceleration due to gravity from the centre of earth to the points far away from the surface of earth

Answer: c (7)

A geostationary satellite orbits around the earth in a circular orbit of radius

A geostationary satellite orbits around the earth in a circular orbit of radius 36000 km. Then, the time period of...

If the distance between the earth and the sun becomes half its present value, the number of days in a year would have been

(a)      64.5                                   (b)   129...

A satellite is launched into a circular orbit of radius R around the earth. A second satellite is launched into an orbit of radius (1.01)R. The period of the second satellite is larger than that of the first one by approximately

(a)      0.5%                                  (b)  1.0%...

A projectile is projected with velocity

A projectile is projected with velocity kve  in vertically upward direction from the ground into the space. (ve is escape...

Two bodies of masses m1 and m2  are initially at rest at infinite distance apart. They are then allowed to move towards each other under mutual gravitational attraction. Their relative velocity of approach at a separation distance r between them is

Two bodies of masses m1 and m2  are initially at rest at infinite distance apart. They are then allowed to...

A solid sphere of uniform density and radius 4 units is located with its centre at the origin O of coordinates. Two spheres of equal radii 1 unit with their centres at A(– 2, 0, 0) and B(2, 0, 0) respectively are taken out of the solid leaving behind spherical cavities as shown in figure

(a)      The gravitational force due to this object at the origin is zero (b)  The gravitational force at the point...

A rocket of mass M is launched vertically from the surface of the earth with an initial speed V. Assuming the radius of the earth to be R and negligible air resistance, the maximum height attained by the rocket above the surface of the earth is

Answer: c (9)

A body of mass m is taken from earth surface to the height h equal to radius of earth, the increase in potential energy will be

(a)      mgR                                    (b) ...

An artificial satellite moving in a circular orbit around the earth has a total (kinetic + potential) energy

An artificial satellite moving in a circular orbit around the earth has a total (kinetic + potential) energy  E0. Its...

A simple pendulum has a time period 

A simple pendulum has a time period  T1 when on the earth’s surface and T2  when taken to a height...

The radius and mass of earth are increased by 0.5%. Which of the following statements are true at the surface of the earth

(a)  g will increase (b)  g will decrease (c)   Escape velocity will remain unchanged (d)     Potential energy will remain...

In order to make the effective acceleration due to gravity equal to zero at the equator, the angular velocity of rotation of the earth about its axis should be

In order to make the effective acceleration due to gravity equal to zero at the equator, the angular velocity of...

3.An inverted bell lying at the bottom of a lake

An inverted bell lying at the bottom of a lake 47.6 m deep has 50 cm3 of air trapped in...

2. Two bodies are in equilibrium when suspended in water from the arms of a balance. The mass of one body is 36 g and its density is

2. Two bodies are in equilibrium when suspended in water from the arms of a balance. The mass of one...

If the radius of the earth were to shrink by 1% its mass remaining the same, the acceleration due to gravity on the earth’s surface would

(a)      Decrease by 2%                       (b) Remain unchanged (c)   Increase by 2%                   ...

Suppose the gravitational force varies inversely as the

  Suppose the gravitational force varies inversely as the nth power of distance. Then the time period of a planet in...

A mass M is split into two parts, m and (M–m), which are then separated by a certain distance. What ratio of m/M maximizes the gravitational force between the two parts

(a)  1/3                                     (b)  1/2 (c)   1/4                                     (d)  1/5 Answer: b (7)

A satellite S is moving in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of earth

(a)      The acceleration of S is always directed towards the centre of the earth (b)  The angular momentum of S...

122. The Poisson’s ratio cannot have the value

(a)  0.7                                     ...

6. If the volume of the given mass of a gas is increased four times, the temperature is raised from 27°C to 127°C. The elasticity will become

(a)   4 times                                   (b)  ...

5. The ratio of the adiabatic to isothermal elasticities of a triatomic gas is

(a)  3/4                                     ...

4. The only elastic modulus that applies to fluids is

  (a)   Young’s modulus                (b)   Shear modulus (c)   Modulus of rigidity             (d)   Bulk modulus Answer-d (17)

3. The specific heat at constant pressure and at constant volume for an ideal gas are

The specific heat at constant pressure and at constant volume for an ideal gas are Cp and Cv and its...

2. The adiabatic elasticity of a gas is equal to

(a)  γ×density                                    (b)   γ×volume (c)   γ×pressure                             ...

1. The isothermal elasticity of a gas is equal to

(a)  Density                                           (b)   Volume (c)   Pressure                             ...

125. Four identical rods are stretched by same force. Maximum extension is produced in

(a)  L=10cm ,D=1mm                 (b)  L=100cm ,D=2mm (c)  L=200cm ,D=3mm          ...

124.

A material has Poisson’s ratio 0.50. If a uniform rod of it suffers a longitudinal strain of 2×10-3 , then...

123. There is no change in the volume of a wire due to change in its length on stretching. The Poisson’s ratio of the material of the wire is

(a)   + 0.50                                     (b)   – 0.50 (c)   0.25                                         (d)   – 0.25 Answer-b (11)

121. The value of Poisson’s ratio lies between

(a) –1 to   1/2                                 ...

120. A rubber cord 10 m long is suspended vertically. How much does it stretch under its own weight (Density of rubber is 1500

A rubber cord 10 m long is suspended vertically. How much does it stretch under its own weight (Density of...

119. A substance breaks down by a stress of

A substance breaks down by a stress of 106 N/m2. If the density of the material of the wire is...

118. A wire of cross section

A wire of cross section 4 mm2 is stretched by 0.1 mm by a certain weight. How far (length) will...

117. A wire of length 2 m is made from  10

A wire of length 2 m is made from  10 cm3 of copper. A force F is applied so that...

113. In the Young’s experiment, If length of wire and radius both are doubled then the value of  Y will become

In the Young’s experiment, If length of wire and radius both are doubled then the value of  Y will become...

116. Young’s modulus of perfectly rigid body material is

(a)   Zero                                        (b)   Infinity (c)  1×1010 N/m2                        (d) ...

115. A wire of diameter 1mm breaks under a tension of 1000 N. Another wire, of same material as that of the first one, but of diameter 2 mm breaks under a tension of

(a)   500 N                                      (b)   1000 N (c)   10000 N                                 (d)   4000 N Answer-d (12)

114. Minimum and maximum values of Poisson’s ratio for a metal lies between

(a)   -∞ to +∞                            (b)   0 to 1 (c)  -∞ to 1                                 (d)   0 to 0.5 Answer-d (12)

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