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A calorimeter contains 5 kg of water at 30°C. A metal of mass 4 kg at 100^oC is added to the calorimeter. The final temperature is recorded as 70^oC. Find the specific heat capacity of the metal. Given: Specific heat capacity of water 4200 J kg^–1 °C^–1.

A kid pushes his toy of weight 100 grams along a distance of 5m on the floor of his house by applying a force of magnitude 9.0 N. What is the energy that has to be put in by the kid for displacing the toy? Is there any change in potential energy possessed by the toy?

A person standing on the edge of a cliff at some height above the ground throws the first ball straight up with an initial velocity u and then throws the second ball straight down with the same initial velocity u. Which of the following statements is TRUE regarding their velocities when they hit the ground?

State Fleming’s Left-hand rule.

List any four characteristics of a good fuel.

The ratio of heat capacity of an object of mass m to specific heat capacity of the material of the body is equal to:

Write a relation for the angle of deviation $\delta$ for a ray of light passing through an equilateral prism in terms of the angle of incidence (i_1), angle of emergence (i_2) and angle of prism (A).

Choose the incorrect statement.

The constituent of biogas which makes it an excellent fuel is:
(a) butane (b) methane (c) propane (d) ethane

Critical angle of glass is ${\theta }_1$ and that of water is ${\theta }_2$. The critical angle for water and glass surface would be:
$({\mu }_g=\frac{3}{2},{\mu }_w=\frac{4}{3})$

How does the light have to enter the glass : (a) to produce a large amount of bending ? (b) for no refraction to happen ?

In a cathode ray tube, the filament is made up of tungsten because

The electrical resistivities of five substances A, B, C, D and E are given below
A) $5.20\times {10}^{-8}\Omega m$
B) $110\times {10}^{-8}\Omega m$
C) $2.60\times {10}^{-8}\Omega m$
D) $10.0\times {10}^{-8}\Omega m$
E) $1.70\times {10}^{-8}\Omega m$

(a) Which substance is the best conductor of electricity Why?
(b) Which one is a better conductor : A or C ? Why
(c) Which substance would you advise to be used for making heating elements of electric irons? Why?
(d) Which two substances should be used for making electric wires ? Why?

Identify the case(s) in which magnetic force acts on the two bodies.

The radius of planet $A$ is half the radius of planet $B$. If the mass of $A$ is $M_A$, what must be the mass of $B$ so that the value of $g$ on $B$ is half that of its value on $A$?

What is the importance of fossils as an evidence of evolution?

List three sources of magnetic fields.

Complete the following sentences :

(i) In a step-up transformer, the number of turns in the primary is________________ then the number of turns in the secondary.

(ii) The transformer is used in ___________ current circuits.

(iii) In a tranformer, the frequency of a.c. voltage _____________ (increase/decreases/remains same)

Monochromatic light is refracted from air into the glass of refractive index The ratio of the wavelength of incident and refracted waves is

[JIPMER 2000; MP PMT 1996, 2003]

From the given figure, calculate the power consumed by B₁, B₂ and also reading in the (V).

How many bricks will be needed to build a wall of $8m\times 6m\times 22.5cm$, where each brick measures $25cm\times 11.25cm\times 6cm$?

We use Fleming’s right hand rule in which of these cases?

Analogous to linear velocity 'v', we use___.

(a) What do you understand by the term "electromagnetic induction" ? Explain with the help of a diagram.

(b) Name one device which works on the phenomenon of electromagnetic induction.

(c) Describe different ways to induce current in a coil of wire.

If a negatively charged body comes in contact with a neutral body and 10 electrons flow towards the neutral body, then find the charge acquired by the neutral body.

Oxygen has three isotopes having mass number 16, 17 and 18. How do atoms of these isotopes differ from each other?

What is the difference between mechanical and non-mechanical waves?

Four wires each of the same length, diameter and material are connected to each other to form a square. If the resistance of each wire is R, then the equivalent resistance across the opposite corners is:

A concave lens always gives a virtual image. In optical lenses worn by humans which of the following statements is true?

Assertion (A): Coal is a fossil fuel.

Reason(R): It is formed due to compression of inorganic material over millions of years.

Select the correct option from the given alternatives.

Way of harness of biomass energy

State Joules Law of Heating.

Q1.how does a moving electron creates magnetic as well as electric field and in what way these two fields are different from each other?

Which of the following is an ohmic resistors?

Which of the these is the closest depiction of light?

Which part of the eye contains cells which are sensitive to light?

Question 76(i)

An average Urban Indian uses about 150 L of water everyday.
$\begin{array}{cc}\text{Activity}& \text{Litres per person per day}\\ \text{Drinking}& 3\\ \text{Cooking}& 4\\ \text{Bathing}& 20\\ \text{Sanitation}& 40\\ \text{Washing clothes}& 40\\ \text{Washing utensils}& 20\\ \text{Gardening}& 23\\ \text{Total}& 150\end{array}$
What percent of water is used for bathing and sanitation together per day?

72 km/h = ___m/s.

To an observer on the ground the passengers and bus on a level road at constant velocity are an example of

A car headlamp of 48 W works on the car battery of 12 V. The correct fuse for the circuit of this car headlamp will be :

(a) 5 A (b) 10 A (c) 3 A (d) 13 A

1. 185

The displacement of a body in $8s$ starting from rest with an acceleration of $20{\text{cm/s}}^2$ is

Q8. Consider the following statements:

1. ISRO’s second mission to the moon, Chandrayaan-II, will be launched in the year 2020.

2. GSAT-6A is a high-power S-band communication satellite.

Which of the statements are correct?