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Question 3680

Vinegar is chemically a:

Adiluted citric acid

Bdiluted acetic acid

Cdiluted hydrochloric acid

Ddiluted oxalic aid

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B. diluted acetic acidExplanation not yet available.

Question 3668

ISRO was establish in which year?

A1976

B1966

C1969

D1970

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C. 1969Explanation not yet available.

Question 3664

Who had discovered oxygen?

ARutherford

BWilliam Harvey

CPriestly

DGalileo

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C. PriestlyExplanation not yet available.

Question 3663

Which one of the following gases, present in the air near the surface of the Earth, has maximum concentrations?

AOxygen

BHydrogen

CNitrogen

DMethane

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C. NitrogenExplanation not yet available.

Question 3662

A concave lens always forms an image which is:

AReal and erect

BVirtual and erect

CReal and inverted

DVirtual and inverted

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B. Virtual and erectExplanation: A concave lens always forms a virtual, erect, and diminished image, regardless of the position of the object. The image formed appears on the same side of the lens as the object and is used in devices like spectacles for correcting short-sightedness (myopia).

Question 3661

Red light is used in traffic signals because:

AIt has the longest wavelength

BIt is beautiful

CIt is visible to people even with bad eyesight

DNone of these

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A. It has the longest wavelengthExplanation: Red light is used in traffic signals because it has the longest wavelength among all visible colors. Due to this property, it gets scattered the least and can travel the farthest through fog, rain, or dust, making it easily visible from a long distance and ideal for indicating ‘stop’.

Question 3660

Monitor of a computer is:

AInput device

BOutput device

CInput/Output device

DNone of these

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B. Output deviceExplanation: A monitor is an output device that displays text, images, and videos generated by the computer. It allows users to visually view the processed data. Common types of monitors include LCD, LED, and OLED screens.

Question 3656

Noise levels in residential areas should not exceed:

A30 decibels

B100 decibels

C85 decibels

D55 decibels

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D. 55 decibelsExplanation: The permissible noise level in residential areas should not exceed 55 decibels (dB) during the daytime and 45 dB at night, as per the Central Pollution Control Board (CPCB) guidelines. Exposure to higher noise levels can lead to stress, disturbed sleep, and hearing impairment.

Question 3642

What is the S.I. unit of electric current?

AVolt

BWatt

CAmpere

DOhm

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C. AmpereExplanation: The S.I. unit of electric current is the Ampere (A). It is defined as the rate of flow of electric charge through a conductor. One ampere equals one coulomb of charge passing through a point in one second.

Question 3641

India's first supercomputer is known as:

ASAGA

BPARAM 8000

CEKA

DPARAM YUVA

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B. PARAM 8000Explanation: PARAM 8000 is India's first supercomputer, developed in 1991 by the Centre for Development of Advanced Computing (C-DAC) under the leadership of Dr. Vijay Bhatkar. It marked India’s entry into high-performance computing and was capable of 1 GigaFLOP (one billion calculations per second).

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Science

Vinegar is chemically a:

ISRO was establish in which year?

Who had discovered oxygen?

Which one of the following gases, present in the air near the surface of the Earth, has maximum concentrations?

A concave lens always forms an image which is:

Red light is used in traffic signals because:

Monitor of a computer is:

Noise levels in residential areas should not exceed:

What is the S.I. unit of electric current?

India's first supercomputer is known as:

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