Deck 18: Physics Forces, Acceleration, and Units

Question 1

1 N is equal to {{}}

A)1 kg m s^-2
B)10 kg m s^-1
C)10 kg m s^-2
D)100 kg m s^-2

Answer 1

1 kg m s^-2

Question 2

Density of air is

A)1⁄8 of water
B)1⁄7 of water
C)1⁄45 of water
D)1⁄800 of water

Answer 2

1⁄800 of water

Question 3

Until a force acts on a body, it's velocity is

A)zero
B)constant
C)increasing
D)decreasing

Answer 3

constant

Question 4

If there is no net force acting on body, then its acceleration is

A)zero
B)constant
C)increasing
D)decreasing

Question 5

Acceleration of a rocket having mass 5000 kg and resultant force acting on it is 200,000 N is {{}}

A)50 m s^-2
B)56 m s^-2
C)70 m s^-2
D)40 m s^-2

Question 6

Force which makes it difficult to run through shallow water is called

A)viscosity
B)up thrust
C)friction
D)drag

Question 7

Prefix for 10^-9is {{}}

A)micro
B)deci
C)centi
D)nano

Question 8

Acceleration due to gravity on moon is

A)9.9 m s^-2
B)9.5 m s^-2
C)6.1 m s^-2
D)1.6 m s^-2

Question 9

An object immersed in fluid experiences an upward force named

A)viscosity
B)drag force
C)up thrust
D)friction

Question 10

If each term in an equation has same base units then the equation is said to be

A)homogeneous
B)non homogeneous
C)equation of straight line
D)equation of circle

Question 11

A force similar to friction is

A)forward force
B)pulling force
C)drag force
D)contact force

Question 12

Forces acting on an object are balanced if resultant force on object is

A)constant
B)zero
C)increasing
D)decreasing

Question 13

Base unit among following is

A)Newton
B)Joule
C)Candela
D)Watt

Question 14

Force provided by breaking system of train if it is decelerating at rate of -3 m s ^-2 and having mass 10,000 kg is {{}}

A)-30,000 N
B)-40,000 N
C)-50,000 N
D)30,000 N

Question 15

Force applied on a body and its acceleration are

A)inversely related
B)directly related
C)not related at all
D)inversely proportional

Question 16

The larger the mass of a moving object the

A)larger the acceleration produced
B)acceleration becomes constant
C)smaller the acceleration
D)acceleration becomes zero

Question 17

500 MW can be written in powers of 10 as {{}}

A)500 × 10⁶
B)500 × 10³
C)500 × 10^-6
D)500 × 10⁹

Question 18

Point where entire weight of an object acts is

A)edge
B)center of gravity
C)central point
D)can be anywhere in body

Question 19

Another name for force of gravity acting on an object is

A)friction
B)air resistance
C)weight
D)mass

Question 20

When two objects are in contact, they exert forces in

A)opposite direction
B)same directions
C)can be both A and B
D)perpendicular direction

Question 21

Activity is proportional to number of

A)daughter nuclei
B)decayed nuclei
C)undecayed nuclei
D)father nuclei

Question 22

Energy given to nucleus to dismantle it increases the

A)kinetic energy of individual nucleons
B)mechanical energy of individual nucleons
C)potential energy of individual nucleons
D)chemical energy of individual nucleons

Question 23

Radioactive decay is a

A)random process
B)non-spontaneous process
C)regular process
D)massive process

Question 24

1 u is equal to {{}}

A)1.660 × 10^-27 kg
B)2 × 10^-27 kg
C)3 × 10^-27kg
D)5 × 10^-27 kg

Question 25

In gamma emission, the change in nucleon number is

A)zero
B)definite
C)increase by 1
D)decreases by 1