MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Games
NEET
Physics NEET MCQ
Units, Dimension And Measurement Mcq
Quiz 8
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Q.1
Assertion: The quantity is dimensionally equal to velocity and numerically equal to velocity of light Reason: µ0 is permeability of vacuum and ε0 is the permittivity of vacuum
0%
a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
0%
b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
0%
c) Assertion is true but, Reason is false
0%
d) Assertion is false but, Reason is true
Explanation
Answer : (b)
Q.2
Assertion:In any mathematical relation between physical quantities the dimensions on both sides must be the same. Reason: The dimensions of a Physical quantities are the power raised on fundamental quantities to obtained derived physical quantity
0%
a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
0%
b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
0%
c) Assertion is true but, Reason is false
0%
d) Assertion is false but, Reason is true
Explanation
Answer : (a)
Q.3
Assertion: Surface energy stands for energy and not for energy per unit area Reason: Dimensions of surface energy are M-1L0T-2
0%
a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
0%
b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
0%
c) Assertion is true but, Reason is false
0%
d) Assertion is false but, Reason is true
Explanation
Answer : (d)
Q.4
The observations of the oscillations of a simple pendulum are 2.63s, 2.56s, 2.42s, 2.71s and 2.80s. Clculate average absolute error
0%
a) 0.1 s
0%
b) 0.11s
0%
c) 0.01 s
0%
d) 1.0s
Explanation
Answer : (b)
Q.5
Assertion: Parallex method cannot be used for measuring distance of stars more than 100light years away Reason: Because parallel angle reduces so much that it cannot be measured accurately
0%
a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
0%
b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
0%
c) Assertion is true but, Reason is false
0%
d) Assertion is false but, Reason is true
Explanation
Answer : (a)
Q.6
The surface area and volume of cube is same then volume is ... ...
0%
a) 216 unit
0%
b) 1000 unit
0%
c) 2000 unit
0%
d) 3000 unit
Explanation
V = a3 Area A = 6a2 given a3 = 6a2 a = 6 Volume = 6× 6×6 = 216 units Answer : (a)
Q.7
From two different unit systems, measurement of one physical quantity are n1 and n2 and their units are u1 and u2 respectively. Find the relation between them?
0%
a) n1u1 = n2u2
0%
b) n1u1 = n2u2 =0
0%
c) n1u2 = n2u1
0%
d) n1+u1 = n2 +u2
Explanation
Answer : (a)
Q.8
If pressure (P), velocity (V) and time (T) are taken as fundamental unit, then what is the dimension of force in new unit system ....
0%
a) PV2T2
0%
b) P-1V3T-2
0%
c) PVT2
0%
d) P-1VT2
Explanation
Force = Pressure × Area Displacement = velocity × Time Area = (Displacement)2 Force = PV2T2 Answer : (a)
Q.9
M1L-1T-2 represent which physical quantity ...
0%
a) stress
0%
b) Young's Modulus
0%
c) Pressure
0%
d) All of the above
Explanation
Answer : (d)
Q.10
What is the dimension for k, in the following equation of wave v = velocity, ω = angular velocity
0%
a) LT
0%
b) T
0%
c) T-1
0%
d) T2
Explanation
Answer : (b)
Q.11
Which of the following is dimensionally correct?
0%
a) Pressure = energy per unit area
0%
b) Pressure = energy per unit time
0%
c) Pressure = energy per unit volume
0%
d) Pressure = momentum per unit time and unit volume
Explanation
Answer : (c)
Q.12
Subtracting 0.2J from 7.26J result in significant figure is ... ..
0%
a) 7.1J
0%
b) 7.06 J
0%
c) 7.0 J
0%
d) 7 J
Explanation
Answer : (a)
Q.13
Dimensional equation of Plank's constant is similar to that of which physical quantity?
0%
a) energy
0%
b) momentum
0%
c) work
0%
d) angular momentum
Explanation
According to Bohr's hypothesis angular momentum = nh/2π Answer : (d)
Q.14
In equation, force = X/density. the dimensional formula of physical quantity X is ... ..
0%
a) M1L4T-2
0%
b) M2L-2T-1
0%
c) M2L-2T-2
0%
d) M1L-2T-1
Explanation
Answer : (c)
Q.15
If Radiation incident on unit surface area per unit time is Q,P=pressure, C = speed of light and quantity denoted by PxQyCx is dimensionless then the value of x, y and z in is ... .
0%
a) x = 1, y = 1, z = -1
0%
b) x = 1, y = -1, z = 1
0%
c) x=-1, y = 1, z = 1
0%
d) x=1, y = 1, z = 1
Explanation
Given that dimensionless M0L0T0 = PxQyCx = [Mx-xT-2x] [MyT-3y] [LzT-z comparing indices on both the side we get x = -y and x = z ∴ option b is correct Answer : (b)
Q.16
If 1 g cm s-1 = x Ns then x = ...
0%
a) 9.8
0%
b) 6 × 104
0%
c) 0.1
0%
d) 10-5
Explanation
Answer : (d)
Q.17
Which of the following physical of quantities have same dimensional formula ?
0%
a) Torque and power
0%
b) Force and torque
0%
c) Torque and enegy
0%
d) Force and power
Explanation
Answer : (c)
Q.18
Match the following
1) Electric Potential V
a) VA
-1
m) M
-1
L
-2
T
4
A
2
2) Capacitance C
b) JC
-1
n) M
1
L
2
T
-3
A
-2
Resistance;
c) CV
-1
p) M
1
L
2
T
-3
A
-1
0%
a) 1 -a,b ; 2 -b m; 3 -c,p
0%
b) 1 -b,m ; 2 -c, p; 3 -a,n
0%
c) 1 -b,p ; 2 -c, m; 3 -a,n
0%
d) 1 -a,m ; 2 -b, n; 3 -c,p
Explanation
Answer : (c)
Q.19
The length, breadth and thickness of metal sheet are 3.241 m, 1.005m and 2.25 cm respectively. The total area and volume of the sheet to the correct number of significant figure are ... m2 and ... m3
0%
a) 6.69, 0.073
0%
b) 3.345, 0.037
0%
c) 8.72, 0.086
0%
d) 6.489, 7.93
Explanation
Answer : (a)
Q.20
In the following formula the percentage of error in the measurement of a, b, c and d are 2%, 1%, 6% and 4% respectively. the percentage error in W is ... ..
0%
a) 14%
0%
b) 21%
0%
c) 16%
0%
d) 15%
Explanation
Answer : (d)
Q.21
Write dimensional formula for electromotive force (emf)
0%
a) M1L-1T-2Q-2
0%
b) M1L2T-2Q-2
0%
c) M1L0T-2Q-2
0%
d) M1L2T-2Q-1
Explanation
Answer : (d)
Q.22
The Sun's angular diameter is measured to be 1920". if the distance of the earth from sun is 1.896×1011m then the diameter of the sun is ... (1"=4.85×10-6 rad)
0%
a) 1.766 ×109 m
0%
b) 1.766 ×1011 m
0%
c) 1.393 ×109 m
0%
d) 1.496 ×1011 m
Explanation
Answer : (a)
Q.23
The length, breadth and thickness of a metal sheet are 4.234m, 1.005 m and 2.01cm respectively. Calculate the total area and volume of the sheet to the correct number of significant figures.
0%
a) 8.72 m2, 0.086 m3
0%
b) 87.2 m2, 0.086 m3
0%
c) 8.72 m2, 0.86 m3
0%
d) 0.872 m2, 0.086 m3
Explanation
Answer : (a)
Q.24
1 g = ... amu
0%
a) 6.024 × 10-29
0%
b) 1.66 ×10-30
0%
c) 6.024 ×1023
0%
d) 1.66 ×10-24
Explanation
1 amu = 1.66 ×10-24g Answer : (c)
Q.25
If Z = A4, then the relative error introduced in Z is ..
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer : (c)
Q.26
The position of particle at any time t is given by following equation. Here v0 is constant and a > o, then the dimensions of v0 and a are
0%
a) M0L1T-1 and T-1
0%
b) M0L1T-1 and L1T-2
0%
c) M0L1T0 and T-1
0%
d) M0L1T-1 and T-1
Explanation
Answer : (a)
Q.27
When the electric current of ( 5 ± 0.5)A flows through the wire. Potential difference developed across it is (40 ± 1) V. Then the resistance of the wire is ....
0%
a) (8 ± 1) Ω
0%
b) (8 ± 0.5) Ω
0%
c) (8 ± 2) Ω
0%
d) ( 8 ± 1.5) Ω
Explanation
Answer : (a)
Q.28
If the units of a, α and β in following equations are m, s-1 and (ms-1)-1 then units of b γ are...
0%
a) m2 and (ms-2)-1
0%
b) m2 and ms-2
0%
c) m and (ms-2)-1
0%
d) m and ms-2
Explanation
Answer : (b)
Q.29
1 fm = ... ..nm
0%
a) 10-9
0%
b) 10-6
0%
c) 10+6
0%
d) 10-3
Explanation
Answer : (b)
Q.30
The dimensional formula for the energy passing through unit area, at any point, per unit time will be .. ...
0%
a) M1L1T-3
0%
b) M1L0T-3
0%
c) M1L0T-1
0%
d) M1L2T-2
Explanation
Answer : (b)
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Support mcqgeeks.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page