#### 11th Standard Physics English Medium Free Online Test Volume 1 One Mark Questions with Answer Key 2020

11th Standard

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Physics

Time : 00:25:00 Hrs
Total Marks : 25

10 x 1 = 10
1. If the force is proportional to square of velocity, then the dimension of proportionality constant is

(a)

[MLT0]

(b)

[MLT-1]

(c)

[MLT-2T]

(d)

[MLT-1T0]

2. If A = 2.331cm and C = 2.1cm, then A + C = ______________cm

(a)

4.4

(b)

4

(c)

4.43

(d)

4.431

3. Which two of the following five physical parameters have the same dimensions?
1.energy density
2.refractive index
3.dielectric constant
4.Young's modulus
5.magnetic field

(a)

1 and 4

(b)

1 and 5

(c)

2 and 4

(d)

3 and 5

4. In equation of motion S = ut+$1\over 2$kt2 the dimensional formula for K is______________

(a)

[L T-1]

(b)

[L T-2]

(c)

[T]

(d)

[L-1 T]

5. Number of significant digits in 3256______.

(a)

1

(b)

2

(c)

3

(d)

4

6. If an object is thrown vertically up with the initial speed u from the ground, then the time taken by the object ' to return back to ground is

(a)

$\frac{u^2}{2g}$

(b)

$\frac{u^2}{g}$

(c)

$\frac{u}{2g}$

(d)

$\frac{2u}{g}$

7. Choose the correct statement from the following

(a)

Centrifugal and centripetal forces are action reaction pairs

(b)

Centripetal forces is a natural force

(c)

Centrifugal force arises from gravitational force

(d)

Centripetal force acts towards the center and centrifugal force appears to act away from the center in a circular motion.

8. Swimming is possible on account of

(a)

I law of motion

(b)

II law

(c)

III law

(d)

Newton's law of gravitation

9. A wind-powered generator converts wind U(x) energy into electric energy. Assume that the generator converts a fixed fraction of the wind energy intercepted by its blades into electrical energy. For wind speed v, the electrical power output will be proportional to,

(a)

v

(b)

v2

(c)

v3

(d)

v4

10. When a mass is rotating in a plane about a fixed point, its angular momentum is directed along,

(a)

a line perpendicular to the plane of rotation

(b)

the line making an angle of 450 to the plane of rotation

(c)