Physics – Class 11 Practice Test 7

1. The orbital velocity of a satellite orbiting a planet of mass “M” and radius “R” at a height as shown is [(G*M)/(R+h)].

True

False

2. A partially elastic body can never be permanently deformed. True or False?

False

True

3. A 10N force is uniformly distributed over the surface of a sphere of radius 20cm. The force at each point acts inward along the normal at that point. Find the fractional change in volume if the compressibility of the sphere is 10^-11m²/N.

1.98*10^-10

2*10^-11

1.5*10^-11

3*10^-10

4. Which of the following options is correct?

A - yield point, B - proportional limit, C - Ultimate tensile strength, D - fracture point

A - yield point, B - elastic limit, C - fracture point, D - Ultimate tensile strength

A - yield point, B - proportional limit, C - fracture point, D - Ultimate tensile strength

A - proportional limit, B - yield point, C - Ultimate tensile strength, D - fracture point

5. Which of the following stresses causes change in density, as long as force acts on the body?

Volumetric stress

Tensile stress

Shear stress

Compressive Stress

6. A force F is applied in a cross-sectional area as shown. The value of F is 20 N and the value of A is 2 m². Find the pressure on the surface.

10 Pa

5 Pa

20 Pa

40 Pa

7. What is the total energy possessed by a satellite of mass “m” orbiting above the earth of mass “M” and radius “R” at a height “h”?

-[(G*M*m)/(R+h)]

[(G*M*m)/(R+h)]

[(G*M*m)/2*(R+h)]

-[(G*M*m)/2*(R+h)]

8. What is the pressure at points A, B, C & D marked in the given mercury barometer? Assume that you have used a tube of length greater than 76cm and then filled it completely with mercury and then inverted into a jar. Let P₀ be atmospheric pressure, g be acceleration due to gravity and ρ be the density of mercury.

P_A = 0, P_B = P₀, P_C = ρg(h+L), P_D = P₀- ρgh

P_A = P₀, P_B = P₀, P_C = P_A, P_D = P₀+ ρgL

P_A = P₀, P_B = 0, P_C = P₀, P_D = ρgL

P_A = 0, P_B = 0, P_C = P₀, P_D = P₀+ ρgL

9. A completely elastic solid body partially regains its shape after removal of external force. True or False?

False

True

10. Bulk modulus is defined as -P / (ΔV/V). Therefore it can be negative. True or False?

True

False