A bullet of mass 12 g is fired from a rifle. The bullet takes 0.006 second to move through its barrel and leaves it with a velocity of 300 m/s. What is the force exerted on the bullet by the rifle?

A bullet of mass 0.05 kg is fired with a velocity of 120 ms-1 from a rifle of mass 4 kg. What will be the recoil velocity of the rifle?

A

1.5 ms^-1

B

1.25 ms-1

C

1.75 ms-1

D

1.0 ms-1

Statement I When a gun is fired, i.e. it placing pushes back with much less velocity than the velocity of the bullet.
Statement II Velocity of the recoiling gun is less because the gun is much heavier than bullet.
According to the Principle of conservation of momentum when the gun is fired, momentum of gun and bullet system remains constant.

A

Both the statements are individually true and statement II is the correct explanation of statement I

B

Both the statements are individually true but statement II is not the correct explanation of statement I

C

Statement I is true, but statement II is false

D

Statement I is false, but statement II is true

A bullet is fired from the rifle. If the rifle recoils freely, then the kinetic energy of the rifle is ___________

A

Less than the kinetic energy of the bullet

B

More than the kinetic energy of the bullet

C

Same as the kinetic energy of the bullet

D

Equal or less than the kinetic energy of the bullet

A bullet is fired from a rifle which recoils after firing. The ratio of kinetic energy of the rifle to that of the bullet is

A

Zero

B

One

C

Less than one

D

More than one

A bullet fired from a rifle travels at an average speed of 2520 km/hr. It hits the target after 0.2 seconds. How far (in m) is the target from the rifle?

A

70

B

140

C

100

D

200

What is the monoisotopic and average mass of valine? Given data: Mass of the most abundant isotope of Carbon (C°)=12.0000, Mass of most abundant isotope of Hydrogen (H°)=1.0078, Mass of most abundant isotope of Oxygen (O°)=15.9949, Mass of most abundant isotope of Nitrogen (N°)=14.0031, The average mass of Carbon (C)=12.011, The average mass of Hydrogen (H)=1.008, The average mass of Oxygen (O)=15.999, The average mass of Nitrogen (N)=14.007.

A

99.068 and 99.2361

B

99.216 and 99.326

C

99.111 and 99.321

D

99.068 and 99.132

A teacher of Class III had asked children to classify the leaves of the following trees/plants into different groups—lemon, mango, basil, mint, neem, banana, etc. Some students classified leaves as (a) leaves with medicinal values and leaves without medicinal values, (b) big leaves and small leaves. The teacher marked group (a) as right and group (b) as wrong. Which of the following statements reflects the teacher's view of learning and assessment?

A

Children bring multiple perspectives in classroom which is to be appreciated.

B

Children can use multiple ways of classification depending upon their experiences.

C

Classification task is very specific and structured and there is one right answer.

D

The activity is focused to seek information from leaves which can be interpreted differently.

Which of the following phrases (i),(ii), and (iii) given below each sentenceshould replace the phrase printed in boldletters to make the sentence grammaticallycorrect? Choose the best option among thefive given alternatives that reflect the correctuse of phrase in the context of thegrammatically correct sentence. If thesentence is correct as it is, mark (E) i.e., "Nocorrection required" as the answer.
The trees shed his leaves every timeautumn approaches but a healthy treealways gets its leaves back in the spring,which explains the point that fighting spirit isenough to keep one afloat.
i. Has shed their leaves every time autumnapproaches
ii. shed their leaves every time autumnapproaches
iii. shed its leaves every time autumnapproaches

A

A. Only i

B

B. Only ii

C

C. Only iii

D

D. i and iii

Which of the following forces are measured directly by strain gauges or force dynamometers during metal cutting? 1. Force exerted by the tool on the chip acting normally to the tool face 2. Horizontal cutting force exerted by the tool on the workpiece 3. Frictional resistance of the tool against the chip flow acting along the tool face 4. Vertical force which helps in holding the tool in position Select the correct answer using the codes given below.

A

1 and 3

B

2 and 4

C

1 and 4

D

2 and 3

A mass m is constrained to move on a horizontal frictionless surface. It is set in circular motion with radius r₀ and angular speed ω₀ by an applied force $$\overrightarrow {\bf{F}} $$ communicated through an inextensible thread that passesthrough a hole on the surface as shown in figure given below. Then, this force is suddenly doubled.
Classical Mechanics mcq question image

The magnitude of the radial velocity of the mass

A

increases till mass falls into hole

B

decreases till mass falls into hole

C

remains constant

D

becomes zero at radius r₁, where 0 1 0

A bullet of mass 12 g is fired from a rifle. The bullet takes 0.006 second to move through its barrel and leaves it with a velocity of 300 m/s. What is the force exerted on the bullet by the rifle?

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