A student used a device to obtain/focus ...

A student used a device to obtain/focus the image of a well illuminate distant building on a scrren as shown below in diagram. Select the correct statement above the device

This device is a concave lens of focla length 8 cm

This device is a onvex mirror of focla length 8 cm

This device is a convex lens of focal length 4 cm

This device is a convex lens of focal length 8 cm.

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Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if asssertion is true, but reason if false, (D) if both assertion and reason are false Assertion : A domestic electrical appliance, working on a three pin, will continue working even if the top pin in removed. Reason : The third pin is used only as a safety device.

Two container each containing liquid water are connected as shown in diagram. Given that vapour pressure of H_(2)O(l) at 300 K and 350 K are 20 torr and 40 torr, select correct statement(s) :

consider the statements given below regarding contraception answer as directed thereafter. (a) medical termination of pregnancy (MTP) during first trimester is generally save, (b) generally chances of conception are Nil until mother breast-feeds the infant up to 2 years. (c) intrauterine devices like copper-T are effective contraceptives. (d) Contraceptive pills may be taken up to 1 week after coitus to prevent conception. which two of the above statements are correct?

classically an electron can be in any orbit around nucleus of an atom. Then what determines the typical atomic size? Why is an atom not, say, thousand times bigger than its typical size? Thequestion had greatly puzzled Bohr before he arrived at his famous model of the atom that you have learnt in the text. To simulate what he might well have done before his discovery, let us play as followswith the basic constants of nature e, me, c and see if we can get a quantity with the dimensions of length that is roughly equal to the known size of an atom (~ 10 m).- You will find that the length obtained above is many orders of magnitude smaller than the atomic dimensions. Further, it involves c. But energies of atoms are mostly in non-relativistic domain where c is not expected to play any role. This is what may have suggested Bohr to discard c and look for else h had already made its appearance elsewhere. Bohr lay in recognising that h, m_e , and e will yield the right atomic size. Construct a quantity with the dimension of length from h, me, and e and confirm that its numerical value has indeed the correct order of magnitude.

The question given below consist of an assertion (A) and a reason ( R). Use the following key to choose the appropriate answer to these questions from the codes (a), (b), ( c) and (d) given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is NOT the correct explanation of A. (c) A is true but R is false. (d) A is false and R is also false. Assertion: Silicon is preferred over germanium for making semiconductor devices. Reason: Energy gap for germanium more than the energy gap of silicon.

select correct statement (s) : lyophobic colloids are used to protect lyophillic colloids, Dehydrating agent is used to coagulation sols, Rubber is obtained by coagulation of latex, sometimes ,the rainfall occurs when two oppositely charged clouds meet.

MODERN PUBLICATION-REFLECTION AND REFRACTION-EXAMPLE

A student used a device to obtain/focus the image of a well illuminate...
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