Physics Test

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Physics Test - 51

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Weekly Quiz Competition

Question 1
1 / -0

Pick out the only scalar quantity

A
power

B
Electric field

C
magnetic momentum

D
average velocity

Solution

Pick out the only scalar quantitypower.
Question 2
1 / -0

Which of the following statements is true regarding a rider in a roller coaster cart moving with a constant speed through a loop?

A
The rider is accelerating.

B
The sum of all the forces acting on the rider is zero

C
Gravity is the only force doingwork on the order

D
There are two forces acting on the rider, but neither does any work on the rider

Solution

For a rider moving through a circular loop with a constant speed, the acceleration can be described as being centripetal or towards the center of the circle. In the case of a rider moving through a noncircular loop at non-constant speed, the acceleration of the rider has two components.
Question 3
1 / -0

The image of an object formed on the retina of the eye is

A
virtual and upright

B
virtual and inverted

C
real and inverted

D
Real and upright

Solution

Although the image is inverted the mental interpretation of the effect on the retina is as though it is erect.
Question 4
1 / -0

No current will flow between two charged bodies if they have the same

A
resistance

B
charge

C
potential

D
charge/ potential ratio

Solution

An electric charge always flows from a body at higher potential to a body at a lower potential irrespective of the amounts of charges contained in them. In the question , no current flows. So there is no potential difference.
Question 5
1 / -0

The most suitable unit for expressing nuclear radius is

A
micro

B
nanometre

C
fermi

D
angstrom

Solution

The most suitable unit for expressing nuclear radius isfermi.
Question 6
1 / -0

The rate of change of linear momentum of a body falling freely under gravity is equal to it's ____ ?

A
Kinetic Energy

B
Weight

C
Potential Energy

D
Impulse

Solution

Rate of change of impulse equals the force . In case of freely falling body the only force is the weight.
Question 7
1 / -0

A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks overboard. The level of water in the pool will

A
increase

B
decrease

C
remains the same

D
first decrease and then increase

Solution

Let M and m grams be the mass of boat + rock in it. By law of floatation(M+m) grams of water will be displaced. This has a volume of (M+m)cc. That means the level of water in pool has risen up by (M+m)cc with the boat + rock when it is floating. If the rocks in the boat are thrown not into the pool but outside, the weight left is only M grams the weight of the boat. This will have displaced M cc of water only i.e less water than in the case of loaded boat. But if the rocks are put in the water in the pool and not outside, then the water in the pool will rise not only by M cc on account of empty boat but also by a volume of the stone put into it. This volume will be m/dwhere m is the mass of rock and d density of rock.

Now m/d is < m. Thus the total rise will be (M+m/d) which is < M + m.
Question 8
1 / -0

1 Joule is Equal to

A
10^3 ergs

B
10^6 ergs

C
10^7 ergs

D
10^5 ergs

Solution

1 Joule = 10^{7 ergs} = 0.000239 Kilo Calories.

Joule is the Unit of Energy.

Joule is equal to Energy transferred to an object when a force of One Newton acts on that object in the direction of its motion through a distance of one metre.(1 N-m)
Question 9
1 / -0

Which Color has the Longest Wavelength?

A
Violet

B
Yellow

C
Red

D
White

Solution

The visible colors from Longest wavelength to Shortest wavelength are :: Red, Orange, Yellow, Green, Blue and Violet.

Red > Orange > Yellow > Green > Blue > Violet.

1. Infrared radiation has a longer wavelength than visible Red light.

2. Ultraviolet radiation has a shorter wavelength than the visible violet light.

3. The white light is a mixture of the colors of the visible spectrum.
Question 10
1 / -0

Temperature can be expressed as derived quantity in terms of any of the following

A
length and mass

B
mass and time

C
length,mass and time

D
in terms of none

Solution

Temperature can be expressed as derived quantity in terms of none.

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Physics Test - 51

Result

Physics Test - 51

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SHARING IS CARING

Question 1

power

Electric field

magnetic momentum

average velocity

Solution

Question 2

The rider is accelerating.

The sum of all the forces acting on the rider is zero

Gravity is the only force doingwork on the order

There are two forces acting on the rider, but neither does any work on the rider

Solution

Question 3

virtual and upright

virtual and inverted

real and inverted

Real and upright

Solution

Question 4

resistance

charge

potential

charge/ potential ratio

Solution

Question 5

micro

nanometre

fermi

angstrom

Solution

Question 6

Kinetic Energy

Weight

Potential Energy

Impulse

Solution

Question 7

increase

decrease

remains the same

first decrease and then increase

Solution

Question 8

10^3 ergs

10^6 ergs

10^7 ergs

10^5 ergs

Solution

Question 9

Violet

Yellow

Red

White

Solution

Question 10

length and mass

mass and time

length,mass and time

in terms of none

Solution

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