1 ) What will be the ratio of total distance moved by a freely falling body till 4 and 5 second of its journey ? (g = 10 m/s2 ).
S(4) : S(5)
A ) 30 : 40 , B ) 32 : 45 ,
C ) 35 : 45 , D ) None of these ,
Correct Answer : - C ) 35 : 45 ,
Solution : -
Formula : -
We have a simple formula for to calculate distance of freely falling object .
S = (g/2)(2t-1) ,
So total distance covered in 4 seconds : -
S(4) = (10/2){2(4)-1} ,
S(4) = 5(7) = 35 m .
So total distance covered in 5 seconds : -
S(5) = (10/2){2(5)-1} ,
S(5) = 5(9) = 45 m ,
So , S(4) : S(5) = 35 : 45 m , Answer .
2 ) A body is falling freely , so what would be the distance covered in only 8th second ?
A ) 7 m , B ) 9 m ,
C ) 10 m , D ) None of these ,
Correct Answer : - C ) 10 m ,
Solution : -
Formula : -
We have a simple formula for to calculate distance of freely falling object .
S = (g/2)(2t-1) ,
So first we calculate the total distance covered till 8 seconds : -
S(8) = (10/2){2(8)-1} ,
S(8) = 5(15) = 75 m .
So total distance covered till 7 seconds : -
S(7) = (10/2){2(7)-1} ,
S(7) = 5( 13 ) = 65 m .
So now we can calculate the distance covered only in 8th second : -
S(8) - S(7) = 75 – 65 = 10 m , Answer.
3 ) Angle between linear and angular velocity for circular motion : -
A ) 0 degree , B ) 45 degree ,
C ) 90 degree , D ) 180 degree ,
Correct Answer : - C ) 90 degree ,
4
) When motor is overloaded , then it
draws ………. Current .
A ) very high , B
) very low ,
C ) no current , D
) None of these ,
Correct
Answer : - A ) very high ,
When
motor is overloaded , then it draws huge amount of current which is higher than
rated current .
5
) Alternating current ………… measured by
DC ammeter .
A ) can be , B
) cannot be ,
C ) may or may not , D ) None of these ,
Correct
Answer : - B ) cannot be ,
6 )
The Frequency of AC mains in Pakistan is
……. ,
A ) 0 hz , B
) 50 hz ,
C ) 100 hz , D
) 180 hz ,
Correct
Answer : - B ) 50 hz ,
The
Frequency of AC mains in Pakistan is 50 hz and voltage is between 220 – 240 V .
7
) Ferromagnetic materials are strongly
attracted by ……….. ( magnetic field ) .
8 )
Zero rest mass means when particle is at rest and its mass is zero .
e.g Photon has zero rest mass.
8
) 1 gray = 100 radians .
10 )
Diamond is a ……… of conductor of electricity .
A ) good conductor , B ) bad conductor ,
C ) may or may not , D ) None of these ,
Correct
Answer : - B ) bad conductor ,
11 ) The first operation involved in Carnot
cycle is ……….. ,
A ) Adiabatic expansion , B
) Isochoric ,
C ) Isothermal expansion , D ) None of these ,
Correct
Answer : - C ) Isothermal expansion ,
12 ) Vectors have maximum ……… (two)
components .
13)
Ballistic missile fails in circumstances of precision due to ………….. ( air
resistance ).
14 ) A body in motion always changes its
…………….. (position vector).
15 ) The tides raise the water in the sea roughly a day ………… ( two time ) .
Now go to online quiz section and check your preparation by this link : -
