Computer 251-300 MCQs

Computer

251. Operating system is like a ________ ?

a. Government

b. Police

c. Parliament

d. All of above

252. Files created with Lotus 1-2-3 have an extension?

a. 123

b. DOC

c. WK1

d. XLS

253. How many sheets are there in Excel Workbook by default?

a. 2

b. 3

c. 4

d. 5

254. Who is the founder of IBM Company?

a. Nolan Bushnell

b. Steve Jobs

c. Thomas J. Watson

d. Bill Gates

255. Shortcut key to create a New Folder on Windows PC is ________ ?

a. Ctrl+N

b. Ctrl+Alt+N

c. Ctrl+Shift+N

d. None

256. The ribbon is used in ________ ?

a. Laser Printer

b. Plotter

c. Ink-jet printer

d. Dot Matrix printer

257. The word Computer used for the first time in ________ ?

a. 1613

b. 1614

c. 1615

d. 1616

258. Compiler can check ________ ?

a. Syntax Error

b. Logical Error

c. Both Logical and Syntax Error

d. None of these

259. Computers that are used in large organizations such as insurance companies and banks, where many people frequently need to use same data, are ________ ?

a. mainframe computers

b. super computers

c. hybrid computers

d. desktop computers

260. In 1940, first electronic computer was invented by _________ ?

a. Clifford Berry

b. George Boole

c. Atanasoff and Berry

d. John V. Atanasoff

261. In computer, ALU has _________ ?

a. 2 units

b. 3 units

c. 4 units

d. 5 units

262. Android was founded in ________ ?

a. 2005

b. 2003

c. 2004

d. 2006

263. How many ways you can save a document in Microsoft word?

a. 3

b. 2

c. 1

d. 5

264. ISP stands for ________ ?

a. Internet Server Provider

b. Internal Server Provider

c. Internet Service Provider

d. Insta Service Provider

265. Handheld computer is also called ________ ?

a. Palmtop computer

b. Laptop computer

c. Notebook computer

d. None of these

266. Types of e-commerce _________ ?

a. Business-to-Business (B2B)

b. Consumer-to-Consumer (C2C)

c. Business-to-Consumer (B2C)

d. All of above

267. An Email is a combination of ________ ?

a. Name and Address

b. Name and Phone no

c. User Name and Domain Name

d. User Name and User id

268. ________ is the process of making changes to a document's existing content.

a. Creating

b. Editing

c. Cutting

d. Forming

269. DBMS stands for ________ ?

a. Database Management System

b. Database Maintenance System

c. Database Maintenance and Storage

d. Database Management Sound

270. SQL is a query language and has types ________ ?

a. Data definition language

b. Data manipulation language

c. Data control language

d. All of the above

271. Which of the following is non-available memory?

a. RAM

b. Register

c. DRAM

d. PROM

272. MS-Access is program for ________ ?

a. Presentation

b. Documentation

c. Calculation

d. Data Base

273. Digital computer was invented by?

a. John Vincent Atanasoff

b. Steve Jobs

c. Charles Babbage

d. James Watson

274. A device through which we enter data in a computer known as ________ ?

a. Storage Device

b. Internal Device

c. Pressing Device

d. Input Device

275. Ctrl+B is used to?

a. To underline the selected text

b. To save the text

c. To Bold the selected text

d. To italic the text

276. The birthplace of the World Wide Web was ________ ?

a. NASA

b. Pentagon

c. CERN

d. Microsoft

277. Which language is used to create macros in Excel?

a. Visual Basic

b. C

c. Visual C++

d. Java

278. Components of computer system are?

a. Hardware

b. Software

c. Applications

d. Both A and B

279. Which language does MS-Word use to create Macros?

a. Visual C++

b. Visual Java

c. Visual Basic

d. None of the above

280. FTP stand for _______ ?

a. File Transfer Post

b. File Transfer Protocol

c. File Transit Protocol

d. None of these

281. In 1999, the Melissa virus was a widely publicized: ________ ?

a. E-mail virus

b. Macro virus

c. Trojan horse

d. Time bomb

282. Disk and tape drives are commonly used?

a. Hard copy

b. Soft copy

c. Secondary storage devices

d. None of the above

283. In peer-to-peer networking:

a. There is only one server and many clients

b. There is only one client and many servers

c. Every computer is capable of playing the role of server

d. Every computer is capable of playing the role of client, server or both at the same time

284. UTP stands for: _______ ?

a. Unshielded Transmission Protocol

b. Unshielded Twisted Pair

c. Unshielded Transfer Pair

d. Unshielded T-line Protocol

285. OCR stands for ________ ?

a. Output Character Recorder

b. Output Character Recognition

c. Optical Character Recorder

d. Optical Character Recognition

286. DVD stands for: ________ ?

a. Digital Versatile Disk

b. Digital Versatile Drive

c. Digital Volume Disk

d. Digital Video Drive

287. Shortcut key to open Font dialog box is ________ ?

a. Ctrl+Shift+D

b. Ctrl+Alt+D

c. Ctrl+D

d. Alt+D

288. Who was the World first Computer Programmer?

a. Niklaus Wirth

b. Ada Lovelace

c. Bill Gates

d. Dennis Ritchie

289. Which shortcut key is used for calculating current sheet in MS Excel?

a. Ctrl+F9

b. Shift+F9

c. F9

d. F7

290. Which technology provides a solution for PC virtualization?

a. Hyper-Visor

b. Server Clustering

c. Terminal Services

d. RAID

291. Shortcut to insert new slide in the current presentation is ________ ?

a. Ctrl+N

b. Ctrl+M

c. Ctrl+O

d. Ctrl+D

292. ________ is the shortcut key to select the entire row in Excel.

a. Alt + Space bar

b. Shift + Space bar

c. Ctrl + Space bar

d. None of these

293. ________ is the shortcut key to select the entire column in Excel.

a. Alt + Space bar

b. Shift + Space bar

c. Ctrl + Space bar

d. None of these

294. Shortcut key to insert a new worksheet in Excel is ________ ?

a. Shift + F8

b. Shift + F9

c. Shift + F10

d. Shift + F11

295. ________ is the largest computer.

a. Mini Computer

b. Micro Computer

c. Mainframe Computer

d. Super Computer

296. ________ is the shortcut key to display active cell in Excel.

a. Shift + Backspace

b. Ctrl + Backspace

c. Alt + Backspace

d. None of these

297. HDMI stands for: _______?

a. High-Definition Multimedia Input

b. High-Density Multichip Interconnect

c. High-Definition Multimedia Interface

d. High-Definition Multichip Interconnect

298. Bit is also called ________.

a. Small

b. Character

c. Byte

d. Binary Digit

299. Website is a ________ .

a. Data

b. Address

c. Search engine

d. None of these

300. API stands for: ________ ?

a. Algorithmic Protocol Interface

b. Adapter Protocol Interface

c. Application Programming Interface

d. Accelerated Programming Interface

General Science 7th Class Chapter 9 Waves and Energy Solved Exercise

 General Science

7th Class

Chapter 9

Waves and Energy

Questions

9.1 Encircle the correct option.

1. Sound waves are not:

a. compressional waves        b. transverse waves

c. mechanical waves        d. low frequency waves

2. Sound cannot pass through:

a. solid        b. liquid        c. gasses        d. vacuum

3. The speed of sound in air is:

a. 100 m/s        b. 340 m/s        c. 1000 m/s        d. 330 km/s

correct 300 on guide

4. Which of the following animals can respond to lowest frequency?

a. cat        b. cow        c. dog        d. elephant

5. Which of the following animals can respond to highest frequency?

a. bat        b. cat        c. frog        d. dolphin

6. Which have audible range for 2k Hz and 120k Hz?

a. human        b. owl        c. bat        d. dolphin

7. Which of the following features is the height of the wave from the rest position or midline?

a. frequency        b. amplitude        c. pitch        d. wavelength

8. Which of the following features of a wave is the number of waves that pass by each second?

a. loudness        b. amplitude        c. frequency        d. wave speed

9. What is transferred by the movement of waves?

a. matter        b. energy        c. nothing        d. both the matter and energy

10. What type of wave does not need matter to travel through?

a. mechanical        b. electromagnetic        c. sound        d. transverse

11. Which sequence of visible colour is correct from longest wavelength to short wavelength?

a. violet, indigo, blue, green, orange, yellow, red

b. red, orange, yellow, green, blue, indigo, violet

c. red, yellow, green, orange, violet, blue, indigo

d. red, yellow, green, orange, violet, indigo, blue

9.2 Define the following:

1. Wave

2. Electromagnetic wave

3. Wavelength

4. Frequency

5. Amplitude

6. Time period

1. Wave

Ans:

A wave is a disturbance or variation that transfers energy progressively from point to point in a medium.

2. Electromagnetic wave

Ans:

Waves which do not require any medium to travel through is called electromagnetic waves. Light waves are the examples of electromagnetic waves.

3. Wavelength

Ans:

Wavelength is the distance between the centres of the compressions or rarefactions of two consecutive waves.

4. Frequency

Ans:

Frequency is the number of waves produced in one second. It is equal to the number of times a body vibrates in one second. Frequency of wave is represented by "f".

5. Amplitude

Ans:

The maximum displacement of the vibrating objects from its mean position is called its amplitude. It is measured in the unit 'metre (m)'.

6. Time period

Ans:

The time during which a body completes one wave cycle is called the time period. It is represented by T.

General Science 7th Class Chapter 8 Force and Motion Solved Exercise

General Science

7th Class

Chapter 8

Force and Motion

Questions

8.1 Encircle the correct option.

1. An example of contact force:

a. electrostatic force        b. muscular force

c. magnetic force        d. gravity

2. The force between two negatively charged particles is:

a. gravitational        b. frictional        c. repulsion        d. attraction

3. Which statement is true?

a. for every action force, there is a smaller reaction force in the opposite direction

b. for every action force, there is a smaller reaction force in the same direction

c. for every action force. there is an equivalent reaction force in opposite direction

d. for every action force, there is an equivalent reaction force in the same direction

4. The Earth's pull on the objects is called:

a. gravity        b. frictional force        c. electrostatic force        d. magnetic force

5. A batsman hits the ball back towards the bowler, which effect of force is seen:

a. change of shape        b. change of direction

c. change of state from motion to rest        d. change of state from rest to motion

6. Which one of the following statements is correct?

a. 1m = 1000 km        b. m/s is the unit of displacement

c. N is the unit of force        d. 1hr = 60s

7. Which one of the following statements is not correct?

a. Displacement is the shortest distance between two points

b. Displacement is the distance covered in one second

c. Meter (m) is the unit of displacement

d. Rate of change of distance with time is called speed

8.2 Define the following:

1. Contact forces

2. Non-contact forces

3. Gravitational force

4. Displacement

5. Speed

1. Contact forces

Ans.

Contact forces are those forces that act only when objects are in physical contact with other objects and bring about necessary changes.

Examples: muscular force, frictional force

2. Non-contact forces

Ans.

Some forces do not involve physical contact between the objects on which they act. They act through the space between them. Such forces are called non-contact forces.

Examples: Magnetic force, electrostatic force and gravitational force.

3. Gravitational force

Ans.

The force due to which every body of the universe attracts every other body is called force of gravitation.

4. Displacement

Ans.

Displacement is defined as the shortest distance between two points.

5. Speed

Ans.

Speed is defined as the distance travelled per unit time.

Speed = Distance / time

General Science 7th Class Chapter 7 Solutions Solved Exercise

General Science

7th Class

Chapter 7

Solutions

Questions

7.1 Encircle the correct option.

1. Which of the following is insoluble in water?

a. sodium chloride        b. oil        c. table salt        d. baking powder

2. A solution to which no more solute can be dissolved at a particular temperature is called:

a. dilute solution        b. concentrated solution

c. saturated solution        d. unsaturated solution

3. A concentrated solution can dissolve in it:

a. no further amount of solute

b. less quantity of solute

c. large quantity of solute

d. amount of solute equal to the amount of solvent

4. Amount of solute required to saturate 100g of solvent at a particular temperature is called:

a. molarity        b. molality        c. normality        d. solubility

5. A solution having relatively less amount of solute dissolved in it is called:

a. dilute solution        b. binary solution

c. concentrated solution        d. saturated solution

7.2 Define the followings:

1. Binary solution

2. Aqueous solution

3. Solute

4. Homogeneous mixture

5. Unsaturated solution

1. Binary solution

Ans.

A solution which is prepared at by mixing only two substances, is called binary solution.

2. Aqueous solution

Ans.

A solution in which water is used as solvent is called aqueous solution.

3. Solute

Ans.

Component of solution present in smaller quantity is called solute.

4. Homogeneous mixture

Ans.

Mixture having same composition in its all parts is called homogenous mixture.

5. Unsaturated solution

Ans.

Solution to which further amount of solute can also be dissolved at a particular temperature is called unsaturated solution.

General Science 7th Class Chapter 6 Chemical Bonds Solved Exercise

General Science

7th Class

Chapter 6

Chemical Bonds

Questions

6.1 Encircle the correct option.

1. A molecule consists of two or more

a. compounds        b. atoms        c. formulae        d. elements

2. Which of the following is a cation?

a. H₂        b. H₂O       c. CO₂       d. NH⁺⁴

3. Which of the following is an anion?

a. F        b. Cl        c. S^2-       d. NH₃

4. Oxygen is a:

a. monovalent element        b. divalent element

c. trivalent element        d. tetravalent element

5. Chemical bond between N₂ molecule is:

a. ionic        b. single covalent        c. double covalent        d. triple covalent

6. How many atoms from one molecule of chlorine gas?

a. 1        b. 2        c. 3        d. 4

7. Outermost shell of sodium atom has _________ electron (s):

a. 1        b. 2        c. 3        d. 4

8. Outermost shell of chlorine atom has ________ electron(s):

a. 1        b. 2        c. 6        d. 7

9. Which of the following has stable electronic configuration?

a. H        b. He        c. C        d. Li

10. Which of the following has double covalent bond?

a. Br₂        b. CO₂       c. HCl       d. N₂ 

6.2 Define the following and explain with examples:

1. Valency

2. Ion

3. Formula

4. Bond

5. Electronic configuration

1. Valency

Ans.

The combining capacity of atoms with other atoms is called valency.

Example: Valency of oxygen is 2 as it combines with two hydrogen atoms to from H₂O

2. Ion

Ans.

The charged particles (atom or group of atoms) are called ion.

Example: Na⁺ is an atom having charge on it while HSO₄^- is a group of atoms having charge on it, both Na⁺ and HSO₄^- are ions.

3. Formula

Ans.

A symbolic representation of an element or compound is called formula.

Example: Formula of oxygen is O₂and sulphuric acid is H₂SO₄

.

4. Bond

Ans.

The force of attraction that holds stoms to together in a substance is called bond.

Example: Bond is present in NaCl which bond Na⁺ and Cl^- together.

5. Electronic configuration

Ans.

The distribution of electrons in the shells around nucleus of an atom is called electronic configuration.

Example: Electronic configuration of Lithium (Li) is 1s² 2s¹.

General Science 7th Class Chapter 5 Physical and Chemical Changes Solved Exercise

General Science

7th Class

Chapter 5

Physical and Chemical Changes

Questions

5.1 Encircle the correct option.

(i) Three of the following are alike. Select the one that is different from the others.

a. Solubility        b. Conductance        c. Oxidation        d. Boiling of a substance

(ii) A physical change occurs when:

a. Iron rusts        b. Solution of common salt is heated

c. A piece of wood burns        d. Sugar is heated strongly

(iii) A gas produced on heating solid potassium chlorate is:

a. Hydrogen        b. Carbon dioxide        c. Methane        d. Oxygen

(iv) Select all that happen during a chemical change.

a. A temporary change occurs

b. Composition of the substances is changed

c. Properties of the substances are changed

d. New substances with different properties are formed

(v) Freezing of a liquid is a:

a. Chemical change        b. chemical property        c. physical change        d. None of above

(vi) What are the products when electric current is passed through water?

a. only steam        b. hydrogen and steam        c. hydrogen and oxygen        d. oxygen and steam

(vii) A piece of iron is kept in open air for 5 days. A film of corrosion formed over it is:

a. iron oxide        b. iron sulphide        c. iron chloride        d. iron hydride

(viii) During combustion, a substance reacts with:

a. hydrogen        b. water        c. carbon dioxide        d. oxygen

(ix) The temperature at which a liquid's vapour pressure is equal to the external pressure surrounding the liquid is:

a. melting point        b. boiling point        c. freezing point        d. highest temperature

(x) Silver + Hydrogen sulphide + Oxygen → Silver sulphide + water

      The above reaction is known as:

a. combustion        b. rusting        c. tarnishing        d. dehydration

5.2 Define the following:

1. Physical change

2. Chemical change

3. Physical property

4. Chemical property

5. Melting point

6. Freezing point

7. Boiling point

8. Solubility

9. Rusting

10. Tarnishing

1. Physical change

Ans.

A change in the physical properties of a substance is called physical change.

2. Chemical change

Ans.

A change in the chemical properties of a substance is called chemical change.

3. Physical property

Ans.

A property due to the physical behaviour of the substance is called physical property.

4. Chemical property

Ans.

A property associated with the chemical structure of the substance is called chemical property.

5. Melting point

Ans.

Melting point is the specific temperature of a solid at which, it begins to melt.

6. Freezing point

Ans.

The temperature at which a liquid starts changing into solid is called freezing point.

7. Boiling point

Ans.

The specific temperature for a liquid at which, it begins to boil and converts from liquid state to gaseous state.

8. Solubility

Ans.

Solubility is the ability of a substance the (solute), to form a solution with another substance the (solvent).

9. Rusting

Ans.

It is a chemical change during which oxygen in the moist air reacts with the iron (Fe) to convert it into iron oxide (rust).

10. Tarnishing

Ans.

It is formation of thin film of corrosion that forms on the surface of objects made of silver, copper, brass, aluminum, magnesium, etc.

General Science 7th Class Chapter 4 Structure of an Atom Solved Exercise

General Science

7th Class

Chapter 4

Structure of an Atom

Questions

4.1 Encircle the correct option.

1. An element with fifteen protons in its atomic nucleus has atomic number:

a. 5        b. 10        c. 15        d. 20

2. The central part of an atom is called:

a. electron        b. proton        c. neutron        d. nucleus

3. Letter K is used to express the ________ shell around the nucleus of an atom.

a. 1st        b. 2nd        c. 3rd        4. 4th

4. The total number of electrons which M shell can a accommodate:

a. 2        b. 8        c. 18        d. 32

5. The particle of an atom having negative charge on it:

a. electron        b. proton        c. neutron        d. nucleus

6. Atomic number of element present in period 2 and group 15 of the Periodic Table:

a. 4        b. 5        c. 6        d. 7

7. How many periods are there in the Periodic Table?

a. five        b. six        c. seven        d. eight

8. Formula showing maximum number of electrons in a shell:

a. n²        b. 2n²        c. 3n²        d. 4n²

9. The mass of an atom is almost due to the:

a. electrons        b. protons        c. neutrons        d. nucleus

10. The particles of an element having different mass numbers:

a. protons        b. neutrons        c. atoms        d. isotopes

4.2 Give short answers.

i. What is atom?

Ans.

An atom is the smallest particle of an element that takes part in a chemical reaction.

ii. Define element.

Ans.

Element is a substance which is made up of same type of atoms.

iii. What type of charge is present on neutron?

Ans.

Neutrons are neutral particles. They have no charge on them.

iv. What do you mean by atomic number?

Ans.

The number of protons present in an atom of an element is called atomic number of that element. It is donated as Z.

v. What is mass number?

Ans.

The total number of protons plus neutrons present in an atom of an element is called mass number of that element. It is donated as A.