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A jet aircraft flies at a speed of 410 m/s. What is this speed known as ?

A
short bar magnet placed in a horizontal plane has its axis aligned
along the magnetic north-south direction. Null points are found on
the axis of the magnet at 14 cm from the centre of the magnet. The
earth’s magnetic field at the place is 0.36 G and the angle of
dip is zero. What is the total magnetic field on the normal bisector
of the magnet at the same distance as the null−point (i.e., 14
cm) from the centre of the magnet? (At null
points, field due to a magnet is equal
and opposite to the horizontal component of earth’s magnetic
field.)

Which of the following are used to study the growth of foetus inside the mother's womb ?

(a) radio waves (b) X-rays (c) infrared waves (4) sound waves

The work done on an object does not depend on the :

(a) displacement

(b) angle between force and displacement

(c) force applied

(d) initial velocity of the object

How does our brain interpret the image that is formed on the retina?

Define thrust. What is its unit?

What name is given to 'thrust per unit area' ?

A man uses a single fixed pulley to lift a bucket of water from a well. The bucket and water together weigh 750N but the man has to apply an effort of 900N to lift the bucket. Calculate the efficiency of the set-up.

If mass and radius of the Earth are $6.0\times {10}^{24}$ $kg$ and $6.4\times {10}^6$ $m$ respectively. The acceleration produced in the body of mass 1 $kg$ and acceleration produced in the Earth are:

Action and reaction forces are _____. They produce _________accelerations in the two bodies, if the mass of the bodies are equal.

भाव
स्पष्ट कीजिए
−

चलो
अभीष्ट मार्ग
में सहर्ष खेलते
हुए,

विपत्ति,
विघ्न
जो पड़ें उन्हें
ढकेलते हुए।

घटे
न हेलमेल हाँ,
बढ़े
न भिन्नता कभी,

अतर्क
एक पंथ के सतर्क
पंथ हों सभी।

The displacement-time graph for a body is given below. State whether the velocity and

acceleration of the body in the region DE are positive, negative or Zero.

What is the magnitude of force needed to produce an acceleration of $4{ms}^{-2}$​ in a ball of $6kg$?

How much is the heat energy produced in $10seconds$ in an electric iron having resistance $440\Omega$, when a potential difference of $220volt$ is applied across it?

A car covers 100 m accelerating from rest in 10 seconds. What is the acceleration of the car?

There is a steel block and plastic block both of the same size. If both blocks are at rest, it means that

If the relative density of an object $\left({\rho }_r\right)$ is $0.6$ and volume $\left(V\right)$ is $1.5m^3$. Calculate the mass $M$ of the object.
Given, density of water, ${\rho }_w=1000kg{m}^{-3}$

The origin of $x$ and $y$ coordinates is the pole of a concave mirror of focal length $20\text{cm}$. The $\text{x-axis}$ is the optical axis with $x>0$ being the rear side of mirror. A point object at the point $(30\text{cm},1\text{cm})$ is moving with a velocity $10\text{cm/s}$ in positive $\text{x-}$direction. The velocity of the image in $\text{cm/s}$ is approximately

A body floats or sinks due to difference in their:

Which of the following is a terrestrial planet?

An electron moving with a velocity of $5\times {10}^{4}m{s}^{-1}$ enters into a uniform electric field and acquires a uniform acceleration of ${10}^{4}m{s}^{-2}$ in the direction of its initial motion. How much distance the electron would cover in $5s$?

What is a hydrometer?Name the principal on which it works

A boy throws a ball upwards , which returns back to him after going to a height of 'h'. What is the displacement of the ball?

नीचे लिखे वाक्य पढ़कर प्रश्नों के उत्तर दो।

"राकेश को गुस्सा भी आ रहा था और रोना भी।"

(क) तुम्हारे विचार से राकेश को गुस्सा और रोना क्यों आ रहा होगा?

"राकेश मंच पर पहुँच गया। सब चुप हो गए, सकपका गए।"

(ख) तुम्हारे विचार से राकेश जब मंच पर पहुँचा, बाकी सब कलाकार क्यों चुप हो गए होंगे?

"दर्शक सब शांत थे, भौंचक्के थे।"

(ग) दर्शक भौंचक्के क्यों हो गए थे?

"मैंने कहा था न कि रिहर्सल में भी यह मानकर चलो कि दर्शक सामने ही बैठे हैं।"

(घ) राकेश ने ऐसा क्यों कहा होगा?