Physics Test 16

Total Questions: 22

3 - Internal part of earth which is molten state due to very high temperature is called.

A ) Troposphere
B ) Magma ✅
C ) Stratosphere
D ) None of these

4 - ____ is burnt to produce electricity.

A ) Metal ✅
B ) Oxygen
C ) Hydrogen
D ) Phosphorus

5 - Einstein's mass energy equation is

A ) E = mc² ✅
B ) E = mc
C ) E = wc
D ) E = wc²

6 - C= ____

A ) 3× 10⁵ms-¹
B ) 3× 10⁶ms-¹
C ) 3× 10⁸ms-¹ ✅
D ) 3× 10¹⁰ms-¹

7 - The ratio b/w output and input energy is called.

A ) Work
B ) Power
C ) Efficiency ✅
D ) Energy

8 - Percentage efficiency of solar cell is

A ) 5%
B ) 3% ✅
C ) 25%
D ) 55%

9 - Percentage efficiency of electric fan is

A ) 5%
B ) 3%
C ) 25%
D ) 55% ✅

10 - Percentage efficiency of electric motor is

A ) 5%
B ) 3%
C ) 80% ✅
D ) 55%

11 - Percentage efficiency of Petrol engine is

A ) 5%
B ) 80%
C ) 25% ✅
D ) 55%

12 - The rate of doing work is called

A ) Work
B ) Power ✅
C ) Energy
D ) Force

13 - Formula of power is

A ) P= w/t ✅
B ) P= t/w
C ) P= wt
D ) P= x/t

14 - Power is a____ quantity

A ) Scalar ✅
B ) Vector
C ) Base
D ) Both a and

15 - Unit of power is ____

A ) Joule
B ) Watt ✅
C ) Newton
D ) Nm

16 - 1 kw=_____

A ) 10³ W ✅
B ) 10⁴ W
C ) 10⁷ W
D ) 10⁶ W

17 - IMW = ____

A ) 10³W
B ) 10⁶W ✅
C ) 10⁷W
D ) 10⁴W

18 - 1 hP=____

A ) 746 W ✅
B ) 764 W
C ) 700 W
D ) 754 W

19 - Work will be zero when angle b/w force and distance is

A ) 45°
B ) 60°
C ) 90° ✅
D ) 180°

21 - If the velocity of a body becomes double then its K.E will be

A ) Constant
B ) Double
C ) Four time ✅
D ) Half

22 - Percentage efficiency of electric lamp is

A ) 5% ✅
B ) 3%
C ) 25%
D ) 55%