Concept-wise Practice

decreasing MCQ Questions for Class 10

decreasing se related questions ko ek jagah revise karein. Har question me bilingual content, answer feedback aur explanation available hai.

Practice Questions

28 questions tagged with decreasing.

एक सीढ़ीनुमा दीवार में नीचे की पंक्ति में (210) पत्थर हैं और हर ऊपर की पंक्ति में (10) पत्थर कम हैं। किस पंक्ति में (70) पत्थर होंगे?

A stepped wall has (210) stones in the bottom row and (10) fewer stones in each upper row. Which row will have (70) stones?

Explanation opens after your attempt
Correct Answer

C. (15)

Step 1

Concept

From (210+(n-1)(-10)=70), (n=15). Exam tip: keep (d) negative in a decreasing AP.

Step 2

Why this answer is correct

The correct answer is C. (15). From (210+(n-1)(-10)=70), (n=15). Exam tip: keep (d) negative in a decreasing AP.

Step 3

Exam Tip

(210+(n-1)(-10)=70) से (n=15) मिलता है। परीक्षा में घटती श्रेणी में (d) को ऋणात्मक रखें।

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एक कारखाना पहले दिन (720) इकाइयां बनाता है और हर अगले दिन (24) इकाइयां कम बनाता है। पहले (16) दिनों में कुल उत्पादन कितना होगा?

A factory makes (720) units on the first day and (24) fewer units each next day. What is the total production in the first (16) days?

Explanation opens after your attempt
Correct Answer

D. (8640)

Step 1

Concept

The production is the decreasing AP \(720,696,672,\ldots\) and \(S_{16}=8640\). Exam tip: treat decrease as a negative common difference.

Step 2

Why this answer is correct

The correct answer is D. (8640). The production is the decreasing AP \(720,696,672,\ldots\) and \(S_{16}=8640\). Exam tip: treat decrease as a negative common difference.

Step 3

Exam Tip

उत्पादन \(720,696,672,\ldots\) घटती समान्तर श्रेणी है और \(S_{16}=8640\)। परीक्षा में कमी को ऋणात्मक सार्व अंतर मानें।

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एक सीढ़ी में नीचे की पंक्ति में (180) टाइलें हैं और हर ऊपर की पंक्ति में (8) टाइलें कम हैं। किस पंक्ति में (68) टाइलें होंगी?

A staircase has (180) tiles in the bottom row and (8) fewer tiles in each upper row. Which row will have (68) tiles?

Explanation opens after your attempt
Correct Answer

C. (15)

Step 1

Concept

From (180+(n-1)(-8)=68), (n=15). Exam tip: handle the sign carefully in a decreasing AP.

Step 2

Why this answer is correct

The correct answer is C. (15). From (180+(n-1)(-8)=68), (n=15). Exam tip: handle the sign carefully in a decreasing AP.

Step 3

Exam Tip

(180+(n-1)(-8)=68) से (n=15) मिलता है। परीक्षा में घटती श्रेणी में चिन्ह सावधानी से रखें।

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एक फैक्टरी पहले दिन (600) इकाइयां बनाती है और हर अगले दिन (22) इकाइयां कम बनाती है। पहले (18) दिनों में कुल उत्पादन कितना होगा?

A factory makes (600) units on the first day and (22) fewer units each next day. What is the total production in the first (18) days?

Explanation opens after your attempt
Correct Answer

D. (7434)

Step 1

Concept

The production is the decreasing AP \(600,578,556,\ldots\) and \(S_{18}=7434\). Exam tip: treat a decrease as a negative common difference.

Step 2

Why this answer is correct

The correct answer is D. (7434). The production is the decreasing AP \(600,578,556,\ldots\) and \(S_{18}=7434\). Exam tip: treat a decrease as a negative common difference.

Step 3

Exam Tip

उत्पादन \(600,578,556,\ldots\) घटती समान्तर श्रेणी है और \(S_{18}=7434\)। परीक्षा में कमी को ऋणात्मक सार्व अंतर मानें।

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एक वेबसाइट पर पहले दिन (900) विजिट आए और हर अगले दिन (50) विजिट कम हुए। (10) दिनों में कुल कितने विजिट आएंगे?

A website gets (900) visits on the first day and (50) fewer visits each next day. How many visits are received in (10) days?

Explanation opens after your attempt
Correct Answer

C. (6750)

Step 1

Concept

The visits form the decreasing AP \(900,850,800,\ldots\) and \(S_{10}=6750\). Exam tip: keep (d) negative for decreasing numbers.

Step 2

Why this answer is correct

The correct answer is C. (6750). The visits form the decreasing AP \(900,850,800,\ldots\) and \(S_{10}=6750\). Exam tip: keep (d) negative for decreasing numbers.

Step 3

Exam Tip

विजिट \(900,850,800,\ldots\) घटती समान्तर श्रेणी हैं और \(S_{10}=6750\)। परीक्षा में घटती संख्या के लिए (d) ऋणात्मक रखें।

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एक मशीन पर पहले दिन (1000) रुपये खर्च हुए और हर अगले दिन (45) रुपये कम खर्च हुए। (12) दिनों में कुल खर्च कितना होगा?

A machine costs (1000) rupees on the first day and (45) rupees less each next day. What is the total cost in (12) days?

Explanation opens after your attempt
Correct Answer

D. (9030)

Step 1

Concept

The costs form the decreasing AP \(1000,955,910,\ldots\) and \(S_{12}=9030\). Exam tip: take (d) negative for decreasing costs.

Step 2

Why this answer is correct

The correct answer is D. (9030). The costs form the decreasing AP \(1000,955,910,\ldots\) and \(S_{12}=9030\). Exam tip: take (d) negative for decreasing costs.

Step 3

Exam Tip

खर्च \(1000,955,910,\ldots\) घटती समान्तर श्रेणी है और \(S_{12}=9030\)। परीक्षा में घटते खर्च के लिए (d) ऋणात्मक लें।

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एक मंच सजावट में पहली पंक्ति में (96) लाइटें हैं और हर अगली पंक्ति में (4) लाइटें कम हैं। (18) पंक्तियों में कुल कितनी लाइटें होंगी?

In a stage decoration the first row has (96) lights and each next row has (4) fewer lights. How many lights are there in (18) rows?

Explanation opens after your attempt
Correct Answer

C. (1116)

Step 1

Concept

The lights form the decreasing AP \(96,92,88,\ldots\) and \(S_{18}=1116\). Exam tip: in decreasing rows the common difference is negative.

Step 2

Why this answer is correct

The correct answer is C. (1116). The lights form the decreasing AP \(96,92,88,\ldots\) and \(S_{18}=1116\). Exam tip: in decreasing rows the common difference is negative.

Step 3

Exam Tip

लाइटें \(96,92,88,\ldots\) घटती समान्तर श्रेणी हैं और \(S_{18}=1116\)। परीक्षा में घटती पंक्ति में सार्व अंतर ऋणात्मक होता है।

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एक गोदाम में पहले दिन (500) पैकेट रखे गए और हर अगले दिन (25) पैकेट कम रखे गए। (14) दिनों में कुल कितने पैकेट रखे गए?

In a warehouse (500) packets are stored on the first day and (25) fewer packets are stored each next day. How many packets are stored in (14) days?

Explanation opens after your attempt
Correct Answer

C. (4725)

Step 1

Concept

The packet numbers form a decreasing AP and \(S_{14}=4725\). Exam tip: take a decrease as a negative common difference.

Step 2

Why this answer is correct

The correct answer is C. (4725). The packet numbers form a decreasing AP and \(S_{14}=4725\). Exam tip: take a decrease as a negative common difference.

Step 3

Exam Tip

पैकेटों की संख्या घटती समान्तर श्रेणी है और \(S_{14}=4725\)। परीक्षा में कमी को ऋणात्मक सार्व अंतर मानें।

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एक फैक्टरी पहले दिन (420) इकाइयां बनाती है और हर अगले दिन (18) इकाइयां कम बनाती है। पहले (15) दिनों में कुल उत्पादन कितना होगा?

A factory makes (420) units on the first day and (18) fewer units each next day. What is the total production in the first (15) days?

Explanation opens after your attempt
Correct Answer

D. (4410)

Step 1

Concept

The production is the decreasing AP \(420,402,384,\ldots\) and \(S_{15}=4410\). Exam tip: treat a decrease as a negative common difference.

Step 2

Why this answer is correct

The correct answer is D. (4410). The production is the decreasing AP \(420,402,384,\ldots\) and \(S_{15}=4410\). Exam tip: treat a decrease as a negative common difference.

Step 3

Exam Tip

उत्पादन \(420,402,384,\ldots\) घटती समान्तर श्रेणी है और \(S_{15}=4410\)। परीक्षा में कमी को ऋणात्मक सार्व अंतर मानें।

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एक सीढ़ी में नीचे की पंक्ति में (132) टाइलें हैं और हर ऊपर की पंक्ति में (6) टाइलें कम हैं। किस पंक्ति में (54) टाइलें होंगी?

A staircase has (132) tiles in the bottom row and (6) fewer tiles in each upper row. Which row will have (54) tiles?

Explanation opens after your attempt
Correct Answer

D. (14)

Step 1

Concept

From (132+(n-1)(-6)=54), (n=14). Exam tip: handle the sign carefully in a decreasing AP.

Step 2

Why this answer is correct

The correct answer is D. (14). From (132+(n-1)(-6)=54), (n=14). Exam tip: handle the sign carefully in a decreasing AP.

Step 3

Exam Tip

(132+(n-1)(-6)=54) से (n=14) मिलता है। परीक्षा में घटती श्रेणी में चिन्ह सावधानी से रखें।

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एक फैक्टरी पहले दिन (360) इकाइयां बनाती है और हर अगले दिन (15) इकाइयां कम बनाती है। पहले (16) दिनों में कुल उत्पादन कितना होगा?

A factory makes (360) units on the first day and (15) fewer units each next day. What is the total production in the first (16) days?

Explanation opens after your attempt
Correct Answer

D. (3960)

Step 1

Concept

The production is the decreasing AP \(360,345,330,\ldots\) and \(S_{16}=3960\). Exam tip: treat a decrease as a negative common difference.

Step 2

Why this answer is correct

The correct answer is D. (3960). The production is the decreasing AP \(360,345,330,\ldots\) and \(S_{16}=3960\). Exam tip: treat a decrease as a negative common difference.

Step 3

Exam Tip

उत्पादन \(360,345,330,\ldots\) घटती समान्तर श्रेणी है और \(S_{16}=3960\)। परीक्षा में कमी को ऋणात्मक सार्व अंतर मानें।

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एक सीढ़ी में नीचे की पंक्ति में (110) टाइलें हैं और हर ऊपर की पंक्ति में (5) टाइलें कम हैं। किस पंक्ति में (55) टाइलें होंगी?

A staircase has (110) tiles in the bottom row and (5) fewer tiles in each upper row. Which row will have (55) tiles?

Explanation opens after your attempt
Correct Answer

C. (12)

Step 1

Concept

From (110+(n-1)(-5)=55), (n=12). Exam tip: handle the sign carefully in a decreasing AP.

Step 2

Why this answer is correct

The correct answer is C. (12). From (110+(n-1)(-5)=55), (n=12). Exam tip: handle the sign carefully in a decreasing AP.

Step 3

Exam Tip

(110+(n-1)(-5)=55) से (n=12) मिलता है। परीक्षा में घटती श्रेणी में चिन्ह सावधानी से रखें।

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एक फैक्टरी पहले दिन (300) इकाइयां बनाती है और हर अगले दिन (20) इकाइयां कम बनाती है। पहले (12) दिनों में कुल उत्पादन कितना होगा?

A factory makes (300) units on the first day and (20) fewer units each next day. What is the total production in the first (12) days?

Explanation opens after your attempt
Correct Answer

D. (2280)

Step 1

Concept

The production is the decreasing AP \(300,280,260,\ldots\) and \(S_{12}=2280\). Exam tip: treat a decrease as a negative common difference.

Step 2

Why this answer is correct

The correct answer is D. (2280). The production is the decreasing AP \(300,280,260,\ldots\) and \(S_{12}=2280\). Exam tip: treat a decrease as a negative common difference.

Step 3

Exam Tip

उत्पादन \(300,280,260,\ldots\) घटती समान्तर श्रेणी है और \(S_{12}=2280\)। परीक्षा में कमी को ऋणात्मक सार्व अंतर मानें।

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एक मशीन पहले घंटे (120) पैकेट बनाती है और हर अगले घंटे (8) पैकेट कम बनाती है। पहले (11) घंटों में कुल उत्पादन कितना होगा?

A machine makes (120) packets in the first hour and (8) fewer packets each next hour. What is the total production in the first (11) hours?

Explanation opens after your attempt
Correct Answer

B. (880)

Step 1

Concept

The production is the decreasing AP \(120,112,104,\ldots\) and \(S_{11}=880\). Exam tip: treat a decrease as a negative common difference.

Step 2

Why this answer is correct

The correct answer is B. (880). The production is the decreasing AP \(120,112,104,\ldots\) and \(S_{11}=880\). Exam tip: treat a decrease as a negative common difference.

Step 3

Exam Tip

उत्पादन \(120,112,104,\ldots\) घटती समान्तर श्रेणी है और \(S_{11}=880\)। परीक्षा में कमी को ऋणात्मक सार्व अंतर मानें।

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एक मशीन पहले घंटे (95) पैकेट बनाती है और हर अगले घंटे (5) पैकेट कम बनाती है। पहले (9) घंटों में कुल उत्पादन कितना होगा?

A machine makes (95) packets in the first hour and (5) fewer packets each next hour. What is the total production in the first (9) hours?

Explanation opens after your attempt
Correct Answer

A. (675)

Step 1

Concept

The production is the decreasing AP \(95,90,85,\ldots\) and \(S_9=675\). Exam tip: treat a decrease as a negative common difference.

Step 2

Why this answer is correct

The correct answer is A. (675). The production is the decreasing AP \(95,90,85,\ldots\) and \(S_9=675\). Exam tip: treat a decrease as a negative common difference.

Step 3

Exam Tip

उत्पादन \(95,90,85,\ldots\) घटती समान्तर श्रेणी है और \(S_9=675\)। परीक्षा में कमी को ऋणात्मक सार्व अंतर मानें।

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एक सीढ़ी में सबसे नीचे (52) ईंटें हैं और हर ऊपर वाली पंक्ति में (4) ईंटें कम हैं। (10) पंक्तियों में कुल कितनी ईंटें होंगी?

A staircase has (52) bricks in the bottom row and (4) fewer bricks in each upper row. How many bricks are there in (10) rows?

Explanation opens after your attempt
Correct Answer

A. (340)

Step 1

Concept

This is the decreasing AP \(52,48,44,\ldots\) and \(S_{10}=340\). Exam tip: treat the decrease as a negative common difference.

Step 2

Why this answer is correct

The correct answer is A. (340). This is the decreasing AP \(52,48,44,\ldots\) and \(S_{10}=340\). Exam tip: treat the decrease as a negative common difference.

Step 3

Exam Tip

यह घटती समान्तर श्रेणी \(52,48,44,\ldots\) है और \(S_{10}=340\)। परीक्षा में कमी को ऋणात्मक सार्व अंतर मानें।

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एक सीढ़ी में सबसे नीचे (50) टाइलें हैं और हर ऊपर वाली पंक्ति में (4) टाइलें कम हैं। (9) पंक्तियों में कुल कितनी टाइलें होंगी?

A staircase has (50) tiles in the bottom row and (4) fewer tiles in each upper row. How many tiles are there in (9) rows?

Explanation opens after your attempt
Correct Answer

A. (306)

Step 1

Concept

This is the decreasing AP \(50,46,42,\ldots\). \(S_9=306\), so there are (306) tiles.

Step 2

Why this answer is correct

The correct answer is A. (306). This is the decreasing AP \(50,46,42,\ldots\). \(S_9=306\), so there are (306) tiles.

Step 3

Exam Tip

यह घटती समान्तर श्रेणी \(50,46,42,\ldots\) है। \(S_9=306\) इसलिए कुल (306) टाइलें होंगी।

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एक सीढ़ी में सबसे नीचे (40) टाइलें हैं और हर ऊपर वाली पंक्ति में (3) टाइलें कम हैं। (8) पंक्तियों में कुल कितनी टाइलें होंगी?

A staircase has (40) tiles in the bottom row and (3) fewer tiles in each upper row. How many tiles are there in (8) rows?

Explanation opens after your attempt
Correct Answer

A. (236)

Step 1

Concept

This is the decreasing AP \(40,37,34,\ldots\). \(S_8=236\) so there are (236) tiles.

Step 2

Why this answer is correct

The correct answer is A. (236). This is the decreasing AP \(40,37,34,\ldots\). \(S_8=236\) so there are (236) tiles.

Step 3

Exam Tip

यह घटती समान्तर श्रेणी \(40,37,34,\ldots\) है। \(S_8=236\) इसलिए कुल (236) टाइलें होंगी।

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एक जलाशय में पहले दिन (1000) लीटर पानी है और हर दिन (50) लीटर पानी कम हो जाता है। (8)वें दिन कितना पानी बचेगा?

A reservoir has (1000) litres of water on the first day and (50) litres less each day. How much water remains on the (8)th day?

Explanation opens after your attempt
Correct Answer

B. (650) लीटर

Step 1

Concept

This is a decreasing AP. (a_8=1000+7(-50)=650).

Step 2

Why this answer is correct

The correct answer is B. (650) लीटर. This is a decreasing AP. (a_8=1000+7(-50)=650).

Step 3

Exam Tip

यह घटती समान्तर श्रेणी है। (a_8=1000+7(-50)=650)।

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एक सीढ़ी में सबसे नीचे (45) ईंटें हैं और हर ऊपर वाली पंक्ति में (3) ईंटें कम हैं। (12) पंक्तियों में कुल कितनी ईंटें होंगी?

A stair pattern has (45) bricks in the bottom row and (3) fewer bricks in each upper row. How many bricks are there in (12) rows?

Explanation opens after your attempt
Correct Answer

C. (342)

Step 1

Concept

This is the AP \(45,42,39,\ldots\), and (S_{12}=6[90+11(-3)]=342). Exam tip: treat the decrease as a negative common difference.

Step 2

Why this answer is correct

The correct answer is C. (342). This is the AP \(45,42,39,\ldots\), and (S_{12}=6[90+11(-3)]=342). Exam tip: treat the decrease as a negative common difference.

Step 3

Exam Tip

यह \(45,42,39,\ldots\) श्रेणी है और (S_{12}=6[90+11(-3)]=342)। परीक्षा में कमी को ऋणात्मक सार्व अंतर मानें।

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एक समान्तर श्रेणी में प्रथम पद (25) और सार्व अंतर (-2) है। पहले (20) पदों का औसत क्या होगा?

In an arithmetic progression the first term is (25) and the common difference is (-2). What is the average of the first (20) terms?

Explanation opens after your attempt
Correct Answer

B. (6)

Step 1

Concept

The last term is (25+19(-2)=-13), so the average is \(\frac{25-13}{2}=6\). Exam tip: the average is the average of first and last terms.

Step 2

Why this answer is correct

The correct answer is B. (6). The last term is (25+19(-2)=-13), so the average is \(\frac{25-13}{2}=6\). Exam tip: the average is the average of first and last terms.

Step 3

Exam Tip

अंतिम पद (25+19(-2)=-13) है इसलिए औसत \(\frac{25-13}{2}=6\) है। परीक्षा में औसत प्रथम और अंतिम पद का औसत होता है।

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एक समान्तर श्रेणी में (a=18) और (d=-4) है। पहले कितने पदों का योग (144) होगा?

In an arithmetic progression (a=18) and (d=-4). How many first terms have sum (144)?

Explanation opens after your attempt
Correct Answer

B. (9)

Step 1

Concept

Using the sum formula gives (n=9). Exam tip: even in a decreasing AP, take the positive value of (n).

Step 2

Why this answer is correct

The correct answer is B. (9). Using the sum formula gives (n=9). Exam tip: even in a decreasing AP, take the positive value of (n).

Step 3

Exam Tip

योग सूत्र रखने पर समीकरण से (n=9) मिलता है। परीक्षा में घटती श्रेणी में भी धनात्मक (n) ही लें।

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यदि (S_n=\frac{n}{2}(a+l)), (a=25), (l=5), और (n=7) है, तो योग क्या होगा?

If (S_n=\frac{n}{2}(a+l)), (a=25), (l=5), and (n=7), what is the sum?

Explanation opens after your attempt
Correct Answer

C. (105)

Step 1

Concept

(S_7=\frac{7}{2}(25+5)=105). The first term may be larger, but the formula remains the same.

Step 2

Why this answer is correct

The correct answer is C. (105). (S_7=\frac{7}{2}(25+5)=105). The first term may be larger, but the formula remains the same.

Step 3

Exam Tip

(S_7=\frac{7}{2}(25+5)=105)। पहला पद बड़ा हो सकता है, फिर भी सूत्र वही रहता है।

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एक मोबाइल प्लान में पहले महीने शुल्क (₹900) है और हर महीने (₹35) की छूट बढ़ती है। (10)वें महीने का शुल्क क्या होगा?

In a mobile plan, the fee in the first month is (₹900) and the discount increases by (₹35) each month. What is the fee in the (10)th month?

Explanation opens after your attempt
Correct Answer

C. (₹585)

Step 1

Concept

The fee is decreasing so (d=-35). (a_{10}=900+9(-35)=585).

Step 2

Why this answer is correct

The correct answer is C. (₹585). The fee is decreasing so (d=-35). (a_{10}=900+9(-35)=585).

Step 3

Exam Tip

शुल्क घट रहा है इसलिए (d=-35)। (a_{10}=900+9(-35)=585)।

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एक टैंक में पहले मिनट (180) लीटर पानी है और हर मिनट (12) लीटर पानी निकलता है। (11)वें मिनट में पानी की मात्रा क्या होगी?

A tank has (180) litres of water in the first minute and (12) litres drain out each minute. What is the amount of water in the (11)th minute?

Explanation opens after your attempt
Correct Answer

A. (60) लीटर(60) litres

Step 1

Concept

This is a decreasing AP with (a=180) and (d=-12). (a_{11}=180+10(-12)=60) litres.

Step 2

Why this answer is correct

The correct answer is A. (60) लीटर / (60) litres. This is a decreasing AP with (a=180) and (d=-12). (a_{11}=180+10(-12)=60) litres.

Step 3

Exam Tip

यह घटती समान्तर श्रेणी है जिसमें (a=180) और (d=-12) है। (a_{11}=180+10(-12)=60) लीटर।

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यदि \(a_n=82-4n\) है तो समान्तर श्रेणी का (23)वां पद क्या होगा?

If \(a_n=82-4n\), what will be the (23)rd term of the AP?

Explanation opens after your attempt
Correct Answer

A. (-10)

Step 1

Concept

\(a_{23}=82-4\times23=-10\). Do subtraction carefully in a decreasing direct formula.

Step 2

Why this answer is correct

The correct answer is A. (-10). \(a_{23}=82-4\times23=-10\). Do subtraction carefully in a decreasing direct formula.

Step 3

Exam Tip

\(a_{23}=82-4\times23=-10\)। घटते प्रत्यक्ष सूत्र में घटाव को ध्यान से करें।

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एक मशीन पहले घंटे (500) वस्तुएं बनाती है और हर अगले घंटे उत्पादन (20) वस्तुएं घटता है। (14)वें घंटे का उत्पादन क्या होगा?

A machine makes (500) items in the first hour and production decreases by (20) items each next hour. What is the production in the (14)th hour?

Explanation opens after your attempt
Correct Answer

A. (240)

Step 1

Concept

Here (a=500), (d=-20), so (a_{14}=500+13(-20)=240). In decreasing word problems, take (d) as negative.

Step 2

Why this answer is correct

The correct answer is A. (240). Here (a=500), (d=-20), so (a_{14}=500+13(-20)=240). In decreasing word problems, take (d) as negative.

Step 3

Exam Tip

यहां (a=500), (d=-20), इसलिए (a_{14}=500+13(-20)=240)। घटते शब्द-प्रश्न में (d) ऋणात्मक लें।

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यदि \(a_n=30-3n\) है, तो (6)वाँ पद क्या होगा?

If \(a_n=30-3n\), what will be the (6)th term?

Explanation opens after your attempt
Correct Answer

D. (12)

Step 1

Concept

\(a_6=30-3\times6=12\). Be careful with subtraction in a decreasing general term.

Step 2

Why this answer is correct

The correct answer is D. (12). \(a_6=30-3\times6=12\). Be careful with subtraction in a decreasing general term.

Step 3

Exam Tip

\(a_6=30-3\times6=12\)। घटते हुए सामान्य पद में घटाव सावधानी से करें।

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