Roll No : Name of School : _______________ Time - MM- 45
Date : Name of Assessment :
_______Weekly Test________
Subject : ______Physics_________
Class : ________12_______
1 Write the order of following length in metres : 2
(i) R adius of earth.
(ii) The height of average man.
(iii) Thickness of sheet of paper.
(iv) The radius of hydrogen atom.
(i) 6.4 × 106 m
(ii) 1.8 × 100 m
(iii) 1 × 10−4 m
Ans : (iv) 5 × 10−11 m
2 Find the area of the circle of radius 3.458 cm upto correct significant figures. 2
Area = πr2 = 3.141 × (3.458)2
= 3.141 × 11.96
Ans : = 37.5664 = 37.57 cm2
3 If x = at + bt2, where x is in metre and t in hour, what will be the unit of ‘a’ and 2
‘b ’ ?
Ans :
4 Using the principle of homogeneity of dimensions find which of the following 2
is correct.
where T is the time period, G is gravitational constant, M is mass and r is
radius of orbit.
Ans :
5 Name the physical quantity of the dimension given below : 3
(i) ML0T−3
(ii) ML−1T−1
, (iii) M−1L3T−2
(iv) ML2T−3
(v) ML0T−2
(vi) T−1
(i) Energy intensity
(ii) Coeff. of viscosity
(iii) Gravitational Constant
(iv) Power
Ans : (v) Surface tension or force constant or spring factor.
6 Write the dimensions of the following : 3
(i) Gravitational potential
(ii) Variable force
(iii) Pressure gradient
(iv) Moment of inertia
(v) Buoyant force
(vi) Angular momentum
(vii) Work done by torque
(viii) Moment of momentum
(ix) Moment of force
(x) Pressure energy.
(i) [M0L2T−2]
(ii) [MLT−2]
(iii) [ML−2T−2]
(iv) [ML2T0]
(v) [MLT−2]
(vi) [ML2T−1]
(vii) [ML2T−2]
(viii) [ML2T−1]
(ix) [ML2T−2]
Ans : (x) [ML2T−2]
7 If where the symbols have their usual meanings, then 3
has a dimension of.... .
Ans : Energy
8 Force (F) and density (d) are related as 3
(i) then the dimensions of α are..............,
(ii) then the dimensions of β are....................
(i) [M3/2L−1/2T−2]
Ans : (ii) [M1/2L−3/2T0]
Date : Name of Assessment :
_______Weekly Test________
Subject : ______Physics_________
Class : ________12_______
1 Write the order of following length in metres : 2
(i) R adius of earth.
(ii) The height of average man.
(iii) Thickness of sheet of paper.
(iv) The radius of hydrogen atom.
(i) 6.4 × 106 m
(ii) 1.8 × 100 m
(iii) 1 × 10−4 m
Ans : (iv) 5 × 10−11 m
2 Find the area of the circle of radius 3.458 cm upto correct significant figures. 2
Area = πr2 = 3.141 × (3.458)2
= 3.141 × 11.96
Ans : = 37.5664 = 37.57 cm2
3 If x = at + bt2, where x is in metre and t in hour, what will be the unit of ‘a’ and 2
‘b ’ ?
Ans :
4 Using the principle of homogeneity of dimensions find which of the following 2
is correct.
where T is the time period, G is gravitational constant, M is mass and r is
radius of orbit.
Ans :
5 Name the physical quantity of the dimension given below : 3
(i) ML0T−3
(ii) ML−1T−1
, (iii) M−1L3T−2
(iv) ML2T−3
(v) ML0T−2
(vi) T−1
(i) Energy intensity
(ii) Coeff. of viscosity
(iii) Gravitational Constant
(iv) Power
Ans : (v) Surface tension or force constant or spring factor.
6 Write the dimensions of the following : 3
(i) Gravitational potential
(ii) Variable force
(iii) Pressure gradient
(iv) Moment of inertia
(v) Buoyant force
(vi) Angular momentum
(vii) Work done by torque
(viii) Moment of momentum
(ix) Moment of force
(x) Pressure energy.
(i) [M0L2T−2]
(ii) [MLT−2]
(iii) [ML−2T−2]
(iv) [ML2T0]
(v) [MLT−2]
(vi) [ML2T−1]
(vii) [ML2T−2]
(viii) [ML2T−1]
(ix) [ML2T−2]
Ans : (x) [ML2T−2]
7 If where the symbols have their usual meanings, then 3
has a dimension of.... .
Ans : Energy
8 Force (F) and density (d) are related as 3
(i) then the dimensions of α are..............,
(ii) then the dimensions of β are....................
(i) [M3/2L−1/2T−2]
Ans : (ii) [M1/2L−3/2T0]
